WhenToBird

Mountain Bluebird · Sialia currucoides

When Do Bluebirds Arrive in Wyoming?

Adult male Mountain Bluebird
Photo: Josiah Londerée, CC BY 4.0 via iNaturalist

Mountain Bluebirds reach Wyoming in late February, are common by the second week of March, peak in mid June (13% of checklists), and most are gone by the second week of October. They are the only regular bluebirds in Wyoming.

When to look

First arrivalsFeb 22-28late February
Common byMar 8-14the second week of March
PeakJun 15-21mid June
Most gone byOct 8-14the second week of October

Best: mid June. First arrivals late February; most are gone by the second week of October. Peak: on about 13% of Wyoming checklists.

  1. Jannot usually seen
  2. Febrare
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novrare
  12. Decnot usually seen

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

Bluebirds in Wyoming, species by species

SpeciesFirst arrivalsCommon byPeakMost gone byPeak %
Mountain BluebirdFeb 22-28Mar 8-14Jun 15-21Oct 8-1413%
0%5%10%15%Mountain BluebirdJanFebMarAprMayJunJulAugSepOctNovDec
  • Mountain Bluebird
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 Mountain Bluebird

Share of checklists at the peak
  1. Sublette CountyBest the second week of April · 157 checklists that week, 6,738 in all35%
  2. Weston CountyBest early April · 32 checklists that week, 2,297 in all25%
  3. Crook CountyBest the second week of April · 43 checklists that week, 3,915 in all23%
  4. Teton CountyBest late April · 568 checklists that week, 34,686 in all22%
  5. Big Horn CountyBest mid June · 103 checklists that week, 2,023 in all19%
  6. Park CountyBest early April · 270 checklists that week, 27,277 in all18%

Common questions

When do bluebirds arrive in Wyoming?
Mountain Bluebirds reach Wyoming in late February, are common by the second week of March, peak in mid June (13% of checklists), and most are gone by the second week of October. They are the only regular bluebirds in Wyoming.
When do bluebirds leave Wyoming?
Most Mountain Bluebirds have left Wyoming by the second week of October, when reports fall below half their usual rate. Stragglers are still reported until late October.
When is the best time to see bluebirds in Wyoming?
The Mountain Bluebird is reported most often in mid June, on about 13% of Wyoming checklists.