WhenToBird

Turdus migratorius · Turdidae

When Do American Robins Arrive in Wyoming?

Adult male American Robin
Photo: northerly, CC BY 4.0 via iNaturalist

American Robins are in Wyoming all year, but most are here in summer: numbers build from late March, peak in the second week of May (57% of checklists), and fall back by late September. In the quietest week (early February) they are still on about 9.0% of checklists.

When to look

Numbers buildMar 22-31late March
PeakMay 8-14the second week of May
Fall back bySep 22-30late September
FewestFeb 1-7early February

Best: the second week of May. Here all year; numbers build from late March and fall back by late September. Peak: on about 57% of Wyoming checklists.

  1. Januncommon
  2. Febuncommon
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novuncommon
  12. Decuncommon

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

0%20%40%60%Jan 1-7: 10% of 2543 checklistsJan 8-14: 11% of 2114 checklistsJan 15-21: 11% of 1984 checklistsJan 22-31: 8.5% of 2605 checklistsFeb 1-7: 10% of 1940 checklistsFeb 8-14: 8.4% of 1954 checklistsFeb 15-21: 10% of 2575 checklistsFeb 22-28: 11% of 1932 checklistsMar 1-7: 16% of 2486 checklistsMar 8-14: 22% of 2535 checklistsMar 15-21: 31% of 2726 checklistsMar 22-31: 39% of 4349 checklistsApr 1-7: 43% of 3300 checklistsApr 8-14: 48% of 3500 checklistsApr 15-21: 49% of 3701 checklistsApr 22-30: 54% of 5887 checklistsMay 1-7: 57% of 5341 checklistsMay 8-14: 58% of 6910 checklistsMay 15-21: 57% of 6884 checklistsMay 22-31: 57% of 10652 checklistsJun 1-7: 56% of 6807 checklistsJun 8-14: 56% of 6714 checklistsJun 15-21: 56% of 6708 checklistsJun 22-30: 58% of 8160 checklistsJul 1-7: 56% of 5755 checklistsJul 8-14: 51% of 5379 checklistsJul 15-21: 50% of 5299 checklistsJul 22-31: 44% of 6830 checklistsAug 1-7: 39% of 4581 checklistsAug 8-14: 34% of 4625 checklistsAug 15-21: 32% of 4466 checklistsAug 22-31: 34% of 6562 checklistsSep 1-7: 36% of 4543 checklistsSep 8-14: 34% of 4652 checklistsSep 15-21: 35% of 4186 checklistsSep 22-30: 35% of 5301 checklistsOct 1-7: 33% of 3248 checklistsOct 8-14: 30% of 3010 checklistsOct 15-21: 24% of 2624 checklistsOct 22-31: 17% of 3170 checklistsNov 1-7: 14% of 2110 checklistsNov 8-14: 11% of 2153 checklistsNov 15-21: 11% of 1971 checklistsNov 22-30: 10% of 2136 checklistsDec 1-7: 11% of 1646 checklistsDec 8-14: 9.6% of 1609 checklistsDec 15-21: 12% of 1954 checklistsDec 22-31: 11% of 2392 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

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.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in Wyoming

Best counties

Share of checklists at the peak
  1. Campbell CountyBest the second week of September · 69 checklists that week, 2,801 in all82%
  2. Hot Springs CountyBest early June · 51 checklists that week, 1,345 in all77%
  3. Crook CountyBest late June · 216 checklists that week, 3,915 in all72%
  4. Sheridan CountyBest the second week of June · 191 checklists that week, 6,459 in all71%
  5. Converse CountyBest early May · 108 checklists that week, 3,460 in all70%
  6. Fremont CountyBest early June · 632 checklists that week, 27,707 in all70%

Best spots

Share of checklists at the peak
  1. Camplex ParkCampbell County, best early September · 34 checklists that week, 659 in all100%
  2. Optomist ParkAlbany County, best the second week of June · 41 checklists that week, 2,101 in all98%
  3. Glenrock ParkConverse County, best late May · 24 checklists that week, 380 in all98%
  4. Mcmanamen ParkCampbell County, best the second week of April · 21 checklists that week, 626 in all96%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Wyoming, the American Robin is most often listed on checklists started between 6 and 8 am (53% of those checklists).

0%20%40%60%80%12 am: too few checklists (59) to judge1 am: too few checklists (76) to judge2 am: too few checklists (86) to judge3 am: too few checklists (79) to judge4 am: too few checklists (326) to judge5 am: too few checklists (2271) to judge6 am: 61% of 8808 checklists7 am: 49% of 18458 checklists8 am: 45% of 22143 checklists9 am: 41% of 21499 checklists10 am: 36% of 19425 checklists11 am: 32% of 16017 checklists12 pm: 30% of 13868 checklists1 pm: 28% of 12984 checklists2 pm: 28% of 12605 checklists3 pm: 30% of 11821 checklists4 pm: 33% of 10571 checklists5 pm: 43% of 8746 checklists6 pm: 49% of 6707 checklists7 pm: 52% of 4890 checklists8 pm: too few checklists (2323) to judge9 pm: too few checklists (554) to judge10 pm: too few checklists (134) to judge11 pm: too few checklists (59) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January10%11%11%8.5%
February10%8.4%10%11%
March16%22%31%39%
April43%48%49%54%
May57%58%57%57%
June56%56%56%58%
July56%51%50%44%
August39%34%32%34%
September36%34%35%35%
October33%30%24%17%
November14%11%11%10%
December11%9.6%12%11%

Neighboring states

  • Colorado: arrives mid March, 1 week earlier than Wyoming
  • Utah: arrives mid March, 1 week earlier than Wyoming
  • Montana: arrives mid March, 1 week earlier than Wyoming
  • Idaho: arrives mid March, 1 week earlier than Wyoming

Common questions

When do American Robins arrive in Wyoming?
American Robins are in Wyoming all year, but most are here in summer: numbers build from late March, peak in the second week of May (57% of checklists), and fall back by late September. In the quietest week (early February) they are still on about 9.0% of checklists.
When do American Robins leave Wyoming?
American Robins never fully leave Wyoming: numbers fall back below half their usual rate by late September, but some are still reported in every week, about 9.0% of checklists at the low.
When is the best time to see a American Robin in Wyoming?
The American Robin is reported most often in the second week of May, on about 57% of Wyoming checklists.
Where in Wyoming are American Robins seen most often?
By county, Campbell County, Hot Springs County, and Crook County have the highest peak reporting rates for the American Robin (counties with at least 200 checklists).