Bioblitzes and awareness days
Fixed-window events you can join, or host your own chapter of.
22 resources
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City Nature Challenge
City-versus-city iNaturalist bioblitz over four days at the end of April. Cities and organizations sign up as organizers
Sign your city up as an organizer and get four days of concentrated local records
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Great Southern Bioblitz
The Southern Hemisphere counterpart, four days in spring. You can register your own region
Register your region for the spring counterpart, so southern seasons are not sampled off-cycle
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Asia Nature Challenge
Asia-wide iNaturalist bioblitz, four days of observing from September 11 then an identification phase. The site does not name the year of the current edition, so confirm it before you plan around it
Check the site is advertising a current edition first, then bring your region in as a collaborating organizer
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National Moth Week
Worldwide moth-ing in the last full week of July. Registering your event is the first thing the site asks you to do
Register a moth night in late July and be listed alongside events worldwide
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Audubon Christmas Bird Count
December 14 to January 5. The compiler system lets a group run its own count circle, which makes it the strongest host-your-own event here
Run your own count circle through the compiler system, the easiest way to host a real survey
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Bat Week
October 24 to 31 every year, with a full organizer toolkit
Take the organizer toolkit and run a late-October event without designing materials yourself
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Pollinator Week
Late June, with a toolkit and a map you can add your own activity to
Add your late-June activity to the map so local people can actually find it
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World Migratory Bird Day
Two peak days a year, in May and October, with an event registration form and campaign toolkit
Register an event on either peak day and reuse the ready-made campaign material
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World Wildlife Day
March 3, the UN and CITES day, with an annual theme and posters in three languages
Build March 3 outreach around the annual theme, with posters already available in three languages
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Endangered Species Day
Third Friday in May, with events across the whole month and a promotion toolkit
Schedule anywhere across May rather than only the third Friday, which the toolkit supports
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World Wetlands Day
February 2, with a Ramsar materials pack and a global event map
Pull the Ramsar materials pack for February 2 and add your event to the global map
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International Vulture Awareness Day
First Saturday of September. Submit your event and it appears on the activities page within a couple of days
Submit a September event and see it listed within days, fast for an awareness day
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Save The Frogs Day
April 28 every year, with free event registration
Register a free amphibian education event on April 28 and be listed globally
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World Fish Migration Day
Late May, every second year, and it invites you to register your own event
Register a river event on the biennial date, useful for dam removal and fish passage campaigning
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WeDigBio
Four-day specimen digitization and transcription blitz, twice a year in April and October. Institutions can register events
Get a specimen backlog transcribed in four days by registering your collection as a host
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CWF Great Canadian Bioblitz
Late September observation window with an identification week after
Use the identification week after the recording window to clean records before they reach GBIF
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eBird Big Days
One day of worldwide birding, twice a year: the second Saturday of May and again in October. Participation only, there is no local chapter to run
Join rather than host, and use the single-day snapshot as a global effort comparison
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Great Backyard Bird Count
Four days in mid-February, from Cornell, Audubon and Birds Canada
Point beginners at four days in February when you want volume rather than expertise
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Big Butterfly Count
UK fifteen-minute butterfly counts across three weeks from mid-July
Ask volunteers for fifteen minutes, the shortest commitment here, across three weeks of summer
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FrogID Week
Australian frog-call recording blitz in early November, run by the Australian Museum
Concentrate call recording into November, where a burst of effort yields usable seasonal comparisons
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Aussie Bird Count
Third week of October
Ask for twenty minutes in October, with school and council material already prepared for you
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RSPB Big Garden Birdwatch
One weekend in late January, and one of the largest by participant count
Reach the largest participant pool here, which matters when the goal is public engagement