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Theresa Crimmins

@theresacrimmins.bsky.social
1.8K followers 1.2K following 146 posts

Director, USA National #Phenology Network | Assoc Prof UArizona | | mom | #citizenscience | plant ecologist Follow USA-NPN happenings at @usa-npn.bsky.social

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Reposted by Theresa Crimmins
Brian J. Enquist @bjenquist.bsky.social · 28/09/2026
Please pass along: I’m recruiting PhD students to join our Macroecology Lab. We study physical ecology, macroecology, and biodiversity — spanning scaling, trait-based ecology, theory, comparative biology & ecoinformatics. Several avenues for funding. Please reach out if interested 🧪🌐🌾
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Theresa Crimmins @theresacrimmins.bsky.social · 08/07/2026
Blueberries are a valuable indicator of climate change response! youtube.com/shorts/fULms... #phenology @usa-npn.bsky.social @npr.org @wbur.org
youtube.com
What one Mass. blueberry bush tells scientists about climate change
YouTube video by WBUR
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Theresa Crimmins @theresacrimmins.bsky.social · 25/06/2026
We had a very early start to spring in the West this year, it sustained, and now we can see that the "end" of spring was reached early to very early across pretty much all L48 states #statusofspring www.usanpn.org/data/maps/sp... @usa-npn.bsky.social #phenology
Maps of the USA National Phenology Network's First Leaf Index, First Bloom Index, and Late Bloom Index.
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Theresa Crimmins @theresacrimmins.bsky.social · 12/06/2026
www.wjhl.com/outdoors-app... #phenology You can report your sightings of firefly activity through #NaturesNotebook! www.naturesnotebook.org @usa-npn.bsky.social
wjhl.com
Fireflies lighting up region earlier than usual this year
(WJHL) – For many across Northeast Tennessee and Southwest Virginia, one of the first signs of summer has already arrived. Residents are reporting fireflies appearing a little earlier than th…
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Theresa Crimmins @theresacrimmins.bsky.social · 15/05/2026
This spring is wreaking havoc on fruit trees in parts of the eastern US #falsespring #phenology www.farmprogress.com/orchard-crop...
farmprogress.com
Pennsylvania grower starts long slog to orchard recovery
As spring arrives 10 days earlier on average than four decades ago, growers pay the price with total crop losses.
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Reposted by Theresa Crimmins
Natasha Vizcarra @natashavizcarra.bsky.social · 24/04/2026
Got #pollen #allergies? You might find relief in less-well-lit rural towns than in brightly lit cities. Read more in my latest story for @snexplores.bsky.social bit.ly/3QZzmKF #lightpollution #phenology #pollenseason Interviews w/ Lin Meng, @theresacrimmins.bsky.social & @jonbennie.bsky.social
bit.ly
Got pollen allergies? Light pollution might make them worse
Light pollution in North American cities seems to be tricking plants into releasing pollen for longer periods each year.
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Theresa Crimmins @theresacrimmins.bsky.social · 20/04/2026
Had a little piece post on the MIT Press Reader this morning - always happy to talk about #phenology, why it matters, and how changing phenology might affect us all thereader.mitpress.mit.edu/what-the-cra... @mitpress.bsky.social
thereader.mitpress.mit.edu
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Theresa Crimmins @theresacrimmins.bsky.social · 17/04/2026
Incredible efforts to maintain the 1,200 year-long cherry flowering dataset in Japan. Thank you for your efforts, Dr. Yasuyuki Aono! The world will miss you!! #phenology telefonorojo.mx/man-saved-mi...
telefonorojo.mx
The Man Who Saved a Millennium of Japanese Climate History — Telefonorojo
Yasuyuki Aono didn't just study flowers. He spent his life obsessed with a specific biological clock that's been ticking in Kyoto for over 1,200 years. While mo
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Theresa Crimmins @theresacrimmins.bsky.social · 16/04/2026
The @usa-npn.bsky.social's Late Bloom Index is now live! This map shows where conditions associated with the conclusion of the spring season are being reached early or late. This year, the end of spring is quite early in the SW US; FL is average. www.usanpn.org/data/maps/sp... #phenology
USA National Phenology Network's Late Bloom Index map. This map shows where locations have reached conditions associated with the end of the spring season early or late compared to the 1981-2020 average. The southwestern US and southern Texas have reached this index 1-3 weeks early this year; Florida is pretty much average.
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Theresa Crimmins @theresacrimmins.bsky.social · 02/04/2026
Really nice article and visuals in @washingtonpost.com this morning showing how spring has arrived early - very early - in much of the lower 48 states www.washingtonpost.com/weather/inte... @usa-npn.bsky.social #phenology @bennollweather.bsky.social
washingtonpost.com
See where flowers and leaves are emerging early after record-warm March
About 190 million people across the U.S. are experiencing an early start to spring, based on the behavior of lilac and honeysuckle, data shows.
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Reposted by Theresa Crimmins
Helen Day @lbflyawayhome.bsky.social · 26/03/2026
“Find a hedgerow on a bank and examine just one yard of it. Then make a list of all the different plants you can find in that yard. You will be astonished at the variety” (1965) Artist: Ronald Lampitt Writer: Richard Bowood
Labelled illustration of a very rich, dense hedgerow featuring white dead nettle, violets, Primrose, ferns and sallow willow
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Theresa Crimmins @theresacrimmins.bsky.social · 24/03/2026
With all the recent record-breaking heat in the western states, it's no surprise to see many locations starting spring green-up (L) and flowering (R) 2-4+ weeks early. Early start=early allergies. Subsequent freeze events could do major damage to crops. www.usanpn.org/data/maps/sp... #phenology
Map showing locations (in red tones) where conditions associated with early-season leaf-out are ahead of schedule. Much of the Great Plains is reaching this early-season check-point 3-4 weeks ahead of normal.Map showing locations (in red tones) where conditions associated with early-season flowering are being reached ahead of normal. Oklahoma and surrounding states are reaching this early-season check-point up to 3 weeks early.
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Theresa Crimmins @theresacrimmins.bsky.social · 11/03/2026
Parts of MT reaching leaf-out 30+d early this year. This very early spring is largely occurring in locations where things have been trending earlier over the past 4 decades #phenology www.usanpn.org/data/maps/sp... www.climatecentral.org/climate-matt... @usa-npn.bsky.social @climatecentral.org
Map of whether spring conditions are occurring earlier or later than average in 2026. Source: https://www.usanpn.org/data/maps/springMap showing whether the start of spring has drifted earlier or later from 1981-2025. Source: https://www.climatecentral.org/climate-matters/earlier-spring-2026?lang=en
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Theresa Crimmins @theresacrimmins.bsky.social · 10/03/2026
Join our Keynote Speaker, Mark Hineline, for "A Life in Season" on March 18, 3pm PT / 6pm ET! In this @usa-npn.bsky.social Phenology Week webinar, Mark will take you through themes that have shaped his life, including #phenology. www.usanpn.org/news/article...
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Reposted by Theresa Crimmins
MIT Press @mitpress.bsky.social · 07/03/2026
Buds and bees may not be out yet, but spring is coming! @theresacrimmins.bsky.social joined @thebrianlehrershow.bsky.social to discuss phenology and what changes in plants and animals will signal the coming season. www.wnyc.org/story/wild-n... @wnyc.org
wnyc.org
Wild NYC - Spring is Coming | The Brian Lehrer Show | WNYC
Botanist/ecologist Marielle Anzelone and phenologist Theresa Crimmins introduce a new series on local wildlife.
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Theresa Crimmins @theresacrimmins.bsky.social · 02/03/2026
I'm excited to join @climatecentral.org's Monthly Climate Brief on Thurs, Mar 19. We'll be talking about (surprise!) what is happening this spring and how you can get involved in tracking signs of the season. We'd love to have you join us! #phenology #statusofspring @usa-npn.bsky.social
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Theresa Crimmins @theresacrimmins.bsky.social · 26/02/2026
Early signs of spring in WY - buds swelling on trees & shrubs. Lots of potential for subsequent freeze events there. www.newslj.com/local-trees-... @usa-npn.bsky.social growing degree day anomaly map clearly shows how much warmer than normal it has been so far this year #phenology #statusofspring
Map of growing degree day accumulation anomaly as of Feb 26, 2026 across the lower 48 states in the U.S. Source: https://data.usanpn.org/vis-tool/#/explore-phenological-findings
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Theresa Crimmins @theresacrimmins.bsky.social · 25/02/2026
Do you suffer from cedar fever -- an allergy to mountain cedar (aka Ashe juniper, aka Juniperus ashei)? If so, I'd love to chat. I'm writing a book and want to include a brief bit from the perspective of someone whose life is severely impacted by pollen allergies. DM if interested! #allergies
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Theresa Crimmins @theresacrimmins.bsky.social · 24/02/2026
A great reminder of the differences among astronomical, climatological, and phenological spring: www.bbc.com/weather/arti... #phenology #statusofspring
bbc.com
When does spring start in 2026?
As milder air sweeps across the UK it could start to feel positively spring-like in places. But when does spring officially begin?
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Theresa Crimmins @theresacrimmins.bsky.social · 17/02/2026
The @usa-npn.bsky.social team will be celebrating #Pheology Week Mar 16-20 to coincide with the Spring Equinox. Join us for some fun and educational opportunities to celebrate the start of the spring season! www.usanpn.org/news/article...
Graphic describing the USA National Phenology Network's "Phenology Week" celebration, running Mar 16-20, 2026
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Theresa Crimmins @theresacrimmins.bsky.social · 16/02/2026
All that cold the L48 recently experienced really slowed down the onset of spring. But we are starting to see things pick back up, with extra-early activity in the TX panhandle and through parts of AZ, CA, and up the west coast #statusofspring www.usanpn.org/data/maps/sp... @usa-npn.bsky.social
Map showing whether the conditions associated with springtime biological activity are being reached early or late this year. Online at https://usanpn.org/files/npn/maps/six-leaf-index-anomaly.png
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Theresa Crimmins @theresacrimmins.bsky.social · 09/02/2026
Predict when cherry trees will flower at locations around the globe and win prizes! Both remote and in-person participation opportunities this year! #phenology #ecologicalforecasting #statistics #statusofspring competition.statistics.gmu.edu
competition.statistics.gmu.edu
2026 Prediction Competition - International Cherry Blossom Prediction Competition
When will the cherry trees bloom in 2026? We invite contestants to submit their predictions for Washington, D.C. (USA), Kyoto (Japan), Liestal-Weideli (Switzerland), Vancouver, BC (Canada) and New Yor...
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Reposted by Theresa Crimmins
USA National Phenology Network @usa-npn.bsky.social · 02/02/2026
Our maps of heat accumulation provide a more scientific look at how much heat has accumulated so far this year. Our maps show that heat accumulation is ahead of schedule in much of the west, on time in the Midwest and upper Northeast, and behind schedule in the East.
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Reposted by Theresa Crimmins
USA National Phenology Network @usa-npn.bsky.social · 02/02/2026
According to predictions from NOAA's Climate Prediction Center, Phil may be right for parts of the Northern Great Plains - more cool temperatures are on the way! Much of the SW and SE should see above-avg temps in coming weeks and the NW, MW, and NE should see avg temps.
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Reposted by Theresa Crimmins
USA National Phenology Network @usa-npn.bsky.social · 02/02/2026
To watch the progression of spring across the country, check out our spring forecast maps - updated daily! usanpn.org/data/maps/sp...
usanpn.org
Status of Spring | USA National Phenology Network
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Reposted by Theresa Crimmins
USA National Phenology Network @usa-npn.bsky.social · 02/02/2026
Punxsutawney Phil has made his annual prediction of what the next six weeks of weather will bring. According to Phil, more winter is on the way! But what does the science say? #GroundhogDay Keep track of Spring's arrival: usanpn.org/data/maps/sp...
Groundhog day graphic showing a map of the US with accumulated temperature accumulation, icons denoting Nature's Notebook observations of leaf out and flowering, and forecasts of weather from NOAA.
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Theresa Crimmins @theresacrimmins.bsky.social · 27/01/2026
Cedar fever got you feeling crummy? @usa-npn.bsky.social is collecting of Ashe's juniper pollen development and release through the NASA-funded PollenCAST project! Your observations of when junipers release pollen in TX will support real-time forecasts of airborne pollen usanpn.org/nn/campaigns...
PollenCAST project logoMale Ashe's juniper (Juniperus ashei) tree by Mike Murphy via iNaturalist (CC-BY-NC).
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Theresa Crimmins @theresacrimmins.bsky.social · 21/01/2026
And we're off! Spring has started to arrive in the most southern states, and in parts of TX, LA, and MS, it's >two weeks earlier than "normal" (the last 3 full decades). I feel like a broken record, we say this nearly every spring... #phenology @usa-npn.bsky.social usanpn.org/data/maps/sp...
map showing early start to conditions associated with the start of biological activity in the spring in the Lower 48 states of the US
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Theresa Crimmins @theresacrimmins.bsky.social · 20/01/2026
Awesome @usa-npn.bsky.social partners Toby Ault and Carlos Carillo at @cornelluniversity.bsky.social released their long-lead forecast for spring; they are predicting a pretty early start to springtime activity in much of the U.S. six-ecrl-24.s3.amazonaws.com/index.html #phenology
map of predicted anomaly in start of spring
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Theresa Crimmins @theresacrimmins.bsky.social · 17/01/2026
Spring wildflowers are blooming earlier than in the 1800s... and it's the ones that flower earliest in the season that are showing the greatest shifts in their activity. Great work by Ryan Utz, @jmheberling.bsky.social, and crew: www.alleghenyfront.org/early-spring... #phenology
alleghenyfront.org
Early spring wildflowers are blooming even earlier thanks to climate change
Study authors used botanical records from over 100 years to explore how native wildflower bloom dates in Pennsylvania have changed due to climate change.
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Reposted by Theresa Crimmins
MIT Press @mitpress.bsky.social · 12/01/2026
Writing for NYT, Margaret Roach looks at changing landscapes & weather patterns with new eyes, referring to "Phenology" author Theresa Crimmins' advice to "weave a practice of observing seasonal cycles of plants and animals into your life to contribute to science as well as soothe your soul":
nytimes.com
New Rules for the New Year
Perhaps the best way to confront the swiftly changing landscape is to swallow hard, and then move forward with a fresh approach.
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Theresa Crimmins @theresacrimmins.bsky.social · 12/01/2026
Calling #NaturesNotebook participants! We have an opportunity for 18 observers to be interviewed by undergraduate students at UCLA this spring. The observer profiles will be featured on the @usa-npn.bsky.social website and in future newsletters. Interested? docs.google.com/forms/d/e/1F...
docs.google.com
Sign up to be interviewed by science writing students this spring
We have an opportunity for 18 Nature's Notebook observers to be interviewed by undergraduate students in a science writing course at UCLA titled "Science Writing for Public Engagement and Community Sc...
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Theresa Crimmins @theresacrimmins.bsky.social · 01/01/2026
Amen! New Rules for the New Year www.nytimes.com/2025/12/31/r... #phenology #climatechange #sustainability #keepingittogether
nytimes.com
New Rules for the New Year
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Theresa Crimmins @theresacrimmins.bsky.social · 18/12/2025
December is a time when ‘… of the Year’ pieces appear in all kinds of publications. Nature Plants joined the trend, highlighting the importance of ground-based observations, like the @usa-npn.bsky.social 's plant and animal #phenology reports, in ground-truthing www.nature.com/articles/s41...
nature.com
… of the Year - Nature Plants
December is a time when ‘… of the Year’ pieces appear in all kinds of publications. For this year only, Nature Plants is joining the trend.
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Theresa Crimmins @theresacrimmins.bsky.social · 01/12/2025
Definitely don't miss the virtual gathering of folks involved in tracking #phenology in the U.S. in Jan - it's going to be great!
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Theresa Crimmins @theresacrimmins.bsky.social · 03/11/2025
goodmenproject.com/featured-con... Mt Auburn is a really special place, and their volunteers that track #phenology and other phenomena are really special people!
goodmenproject.com
Cemeteries: How the Dead Protect the Wild
From wildly popular to nearly forgotten, some of our cemeteries play an unexpected role in fostering biodiversity — and may provide climate solutions, too.
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Theresa Crimmins @theresacrimmins.bsky.social · 24/09/2025
www.nbcnews.com/science/clim... #phenology
nbcnews.com
Bright, brief and early: New England's fall foliage may not last long
A season that draws millions of tourists and billions of dollars to the Northeast may be briefer and less predictable this year as climate change reshapes the iconic fall landscape.
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Theresa Crimmins @theresacrimmins.bsky.social · 22/09/2025
Amazing interview with Amanda Wanlass, Executive Director of Indiana #Phenology! www.wishtv.com/beo-show/loc...
wishtv.com
Local Group Helps Track Seasonal Changes in Plants and Animals
The team at Indiana Phenology travels the state, helping small businesses, teachers, and community groups learn how to track important seasonal changes in the environment.
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Theresa Crimmins @theresacrimmins.bsky.social · 22/09/2025
I had such a great time at the Colorado Native Plant Society meeting this past weekend! Made some great friends and enjoyed seeing some glimpses of fall color 🍂#phenology
honey locust with leaves starting to change color
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Reposted by Theresa Crimmins
USA National Phenology Network @usa-npn.bsky.social · 15/09/2025
Applications now open for our Local Phenology Leader Certification Course, an interactive, online 10-week course on planning and implementing a long-term phenological monitoring program for your organization or community. Course runs Sep 29-Dec 5. Apply by Sep 21. www.usanpn.org/nn/LPLCertif...
A badge with people, a bird, leaves, and a flower with a banner that reads Nature's Notebook Certified Local Phenology Leader.
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Theresa Crimmins @theresacrimmins.bsky.social · 14/08/2025
The 2024 #BulletinAMS State of the Climate Assessment is out today. @usa-npn.bsky.social contributed data & info about how #phenology is changing in the U.S. The timing of plant and animal activity such as leaf-out is a strong indicator of species and ecosystem response to changing conditions.
2024 “first leaf” date anomalies across the United States relative to (a) 2023 and (c) the 2011–20 baseline, estimated using the USA National Phenological Network (USA NPN) extended Spring Index (SI-x) model (Day of year of spring (green shades) and autumn (orange and yellow) vegetation phenology indicators for (a),(b) Harvard Forest, Massachusetts, derived from PhenoCam (PC), ground observations (GO) of red oak (Quercus rubra), and the USA National Phenology Network (USA NPN) regional-scale means of red oak observations (calculated across the northeastern states of Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, and Maine, with ±1 std. error shaded)
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Theresa Crimmins @theresacrimmins.bsky.social · 18/07/2025
Hooray @lpzoo.org! Congrats on 5 years of #phenology observations on native hibiscus! www.lpzoo.org/phenology-an...
lpzoo.org
Phenology and Flowers: Researching the Growing Cycles of Plants | Lincoln Park Zoo
An project studying the growing cycles of plants has been going on at Lincoln Park Zoo for five years—and is poised to expand for the next five.
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Theresa Crimmins @theresacrimmins.bsky.social · 09/07/2025
Thank you so much, Michelle Sutton, for the wonderful review of my book, _#Phenology_, in City Trees Magazine! read.dmtmag.com/i/1537178-ju...?
read.dmtmag.com
City Trees - July/August 2025
City Trees is a premier publication focused on urban + community forestry. In each issue, you’ll learn how to best manage the trees in your community and more!
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Theresa Crimmins @theresacrimmins.bsky.social · 20/06/2025
Now, as always, getting outside is good for you and your mood. Thankful for the opportunity to write for Arizona Daily Sun. #phenology azdailysun.com/opinion/colu...
azdailysun.com
Spotlight on Climate: Moments in nature can still soothe your climate-weary soul
And just like that, spring is behind us. The first day of summer will be here this weekend. But around the state, we are lacking some of the classic harbingers
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Theresa Crimmins @theresacrimmins.bsky.social · 14/06/2025
@jeremyclark.bsky.social helped the @usa-npn.bsky.social explore options for generating commercial revenue. It's tough for programs exist to serve the public. I hope our experience can help other programs suddenly struggling with $ loss. agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com
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Theresa Crimmins @theresacrimmins.bsky.social · 12/06/2025
It's not uncommon for spring to start out early and then slow down, or vice-versa... see where either of those sequences of events occurred in the L48 states this past spring: www.climate.gov/news-feature... #phenology @usa-npn.bsky.social @climate.noaa.gov
climate.gov
First blooms of the 2025 spring season were earlier than average across most of the United States
According to a long-term index of flower timing, most U.S. areas saw flowers emerge earlier than average, except for a few, mostly coastal areas.
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Reposted by Theresa Crimmins
Theresa Crimmins @theresacrimmins.bsky.social · 25/10/2024
Call for papers! Special issue in new @SpringerNature journal _Discover Life_ : Plant #phenology in an era of rapid global change: new perspectives and frontiers. Co-editing this collection with the fabulous Rob Guralnick and @diji.bsky.social link.springer.com/collections/...
link.springer.com
Plant phenology in an era of rapid global change: new perspectives and frontiers
Phenology is a crucial indicator of plant responses to environmental changes, with multifaceted implications for individual plants, ecological communities, ...
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Reposted by Theresa Crimmins
Natural History Institute @nhi-prescott.bsky.social · 16/05/2025
Join us for a talk by Theresa Crimmins on how we can all participate in documenting the timing of seasonal life cycle events—with benefits including mental health and supporting climate change action! @theresacrimmins.bsky.social @usa-npn.bsky.social
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Theresa Crimmins @theresacrimmins.bsky.social · 16/05/2025
Today I got to witness a 5' gopher snake devour a young dove right from the nest - wow! #nature
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Reposted by Theresa Crimmins
MIT Press @mitpress.bsky.social · 03/05/2025
No need to dig for your next read: @empressofdirt.bsky.social provides recommendations from her #garden and #nature bookshelf, including "Phenology" by @theresacrimmins.bsky.social and "The Urban Naturalist" by @schilthuizen.bsky.social:
empressofdirt.net
What I’m Reading: Gardening, Nature, & Life Stories — Empress of Dirt
If you’re looking for gardening and nature books that explore how the outdoors shapes our lives (and vice versa), this is a growing list of titles I’m reading, enjoying, and recommending, covering…
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