Date: 6/12/26 2:06 pm From: Justyn Stahl via groups.io <justyn.stahl...> Subject: [SanDiegoRegionBirding] California Bird Atlas Big Weekend 2026 Results
Big Weekend results below, with amended San Diego-specific stats. San Diego
atlasers made up 10% of the people in the field that weekend statewide,
contributing 10% of the checklists, blocks, and codes, and confirming
breeding for about half of the statewide Confirmed species total! In an
incredible coincidence we applied *619* Confirmed codes.
If you’re a San Diego atlaser and you’d like to join the CBA-specific
WhatsApp group, let me know.
Thanks,
Justyn Stahl
North Park
---------- Forwarded message ---------
From: Van Pierszalowski via groups.io <van...>
>
Date: Fri, Jun 12, 2026 at 1:16 PM
Subject: [CALBIRDS] California Bird Atlas Big Weekend 2026 Results
To: <CALBIRDS...>
Hi birders,
I’m happy to report that the inaugural California Bird Atlas Big Weekend
(June 4-7, 2026) was a tremendous success! Thank you so much to our
partners for organizing 54 (!) field trips and events throughout the state
in a single weekend. Special thanks as well to our incredible Regional
Coordinators <https://ebird.org/atlascalifornia/about/regional-coordinators> and the broader atlasing community.
Amazingly, 47% of the confirmed breeding codes recorded during Big Weekend
represented new confirmations (species breeding in atlas blocks where they
hadn't yet been confirmed). This highlights the strategic approach atlasers
took throughout the weekend, focusing their efforts on expanding coverage
and documenting breeding evidence where it mattered most. Many atlasers
reported using Blockboard
<https://cba-blockboard.share.connect.posit.cloud/> to help identify these
opportunities.
- *4,180* Atlas checklists were submitted [For San Diego: 449]
- *1,211* atlasers submitted checklists, including *181* first-time
atlasers [For San Diego: 148 atlasers, with 22 new!]
- *1,575* blocks received data, including *194* blocks that had not
previously received Atlas coverage (see the News post
<https://ebird.org/atlascalifornia/news/big-weekend-review> for a map) [For
San Diego: we visited 142 blocks, 14 for the first time!]
- *26,809* breeding codes were submitted, including *6,121*
confirmed-level codes [For San Diego: 2,612 codes, 619 Confirmed]
- *308* species received breeding codes, including *226* species with
Confirmed-level breeding codes [For San Diego: 151 species were coded,
110 species Confirmed!!!]
- *4,865* confirmed breeding "block ticks" (each species in each block =
one block tick), including 2,287 new confirmed block ticks [For San
Diego: 531 Confirmed "block ticks," 214 new!]
DISCOVERIES
- What appears to be the first confirmed breeding record of *Canyon Wren*
in Solano County was reported
<https://ebird.org/atlascalifornia/checklist/S354320273> by Eric Pilotte
at Stebbins Cold Canyon Reserve on June 7.
- Atlasers added two new species to the Atlas’s list of confirmed
breeders: *Bufflehead* (reported
<https://ebird.org/atlascalifornia/checklist/S352892908> by Sam Eberhard
in Lassen County) and *Green-winged Teal* (reported in three different
blocks — two in Plumas County, one in El Dorado County).
We will be organizing CBA Big Weekends every year throughout the Atlas
period (2026-2030), and it will be exciting to see how the results evolve
from year to year. Thank you again to the incredible birding community, and
here's to another great atlasing weekend starting now.
Happy Atlasing,
Van Pierszalowski
Director, California Bird Atlas
CBA website: www.californiabirdatlas.org
Join the CBA eBird project: www.ebird.org/atlascalifornia
<https://ebird.org/atlascalifornia/home>
-Los Angeles,CA
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#17813): https://groups.io/g/SanDiegoRegionBirding/message/17813 Mute This Topic: https://groups.io/mt/119780959/858290 -=-=-
---
The monthly meetings of San Diego Field Ornithologists (SDFO) are currently virtual, open only to members, at 6pm on the third Tuesday of every month.
