WhenToBird

2 grosbeak species in Wyoming

When Do Grosbeaks Arrive in Wyoming?

Adult Black-headed Grosbeak
Photo: Dan Vickers, CC BY 4.0 via iNaturalist

Black-headed Grosbeaks and Evening Grosbeaks are the grosbeaks you are most likely to see in Wyoming. Black-headed Grosbeaks reach Wyoming in early May, are common by the second week of May, peak in late May (13% of checklists), and most are gone by mid August.

When to look

First arrivalsMay 1-7early May
Common byMay 8-14the second week of May
PeakMay 22-31late May
Most gone byAug 15-21mid August

Best: late May. First arrivals early May; most are gone by mid August. Peak: on about 13% of Wyoming checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Auguncommon
  9. Sepuncommon
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

Darker months: more checklists report it. Outlined: peak month.

Grosbeaks in Wyoming, species by species

SpeciesFirst arrivalsCommon byPeakMost gone byPeak %
Black-headed GrosbeakMay 1-7May 8-14May 22-31Aug 15-2113%
Evening GrosbeakOct 1-7Oct 1-7Mar 1-7Jun 8-142.2%
0%5%10%15%Black-headed GrosbeakEvening GrosbeakJanFebMarAprMayJunJulAugSepOctNovDec
  • Black-headed Grosbeak
  • Evening Grosbeak
Share of complete checklists reporting each species, by week (4 per month). Gaps: fewer than 10 checklists that week.

Frequency is the share of complete checklists in Wyoming that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

Where in Wyoming

Best counties for Black-headed Grosbeak

Share of checklists at the peak
  1. Platte CountyBest late May · 92 checklists that week, 1,645 in all33%
  2. Crook CountyBest late May · 305 checklists that week, 3,915 in all27%
  3. Weston CountyBest mid May · 73 checklists that week, 2,297 in all26%
  4. Uinta CountyBest early June · 61 checklists that week, 1,881 in all22%
  5. Fremont CountyBest late May · 1152 checklists that week, 27,707 in all22%
  6. Lincoln CountyBest late May · 191 checklists that week, 3,169 in all21%

Common questions

When do grosbeaks arrive in Wyoming?
Black-headed Grosbeaks reach Wyoming in early May, are common by the second week of May, peak in late May (13% of checklists), and most are gone by mid August.
When do grosbeaks leave Wyoming?
Most Black-headed Grosbeaks have left Wyoming by mid August, when reports fall below half their usual rate. Stragglers are still reported until early September.
When is the best time to see grosbeaks in Wyoming?
The Black-headed Grosbeak is reported most often in late May, on about 13% of Wyoming checklists.
Which grosbeaks are in Wyoming?
Black-headed Grosbeak and Evening Grosbeak are reported regularly; the Black-headed Grosbeak is the most common.