WhenToBird

Passerella iliaca · Passerellidae

When Do Fox Sparrows Arrive in Wyoming?

Adult Fox Sparrow
Photo: Kevin Krebs, CC BY 4.0 via iNaturalist

Fox Sparrows arrive in Wyoming in mid April, peak in late June (1.9% of checklists), and most are gone by late July.

When to look

First arrivalsApr 15-21mid April
Common byApr 15-21mid April
PeakJun 22-30late June
Most gone byJul 22-31late July

Best: late June. First arrivals mid April; most are gone by late July. Peak: on about 1.9% of Wyoming checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Apruncommon
  5. Maycommon
  6. Junpeak season
  7. Julpeak season
  8. Auguncommon
  9. Sepuncommon
  10. Octrare
  11. Novrare
  12. Decrare

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

0%0.5%1%1.5%2%Jan 1-7: 0% of 2543 checklistsJan 8-14: 0% of 2114 checklistsJan 15-21: 0% of 1984 checklistsJan 22-31: 0% of 2605 checklistsFeb 1-7: 0% of 1940 checklistsFeb 8-14: 0% of 1954 checklistsFeb 15-21: 0% of 2575 checklistsFeb 22-28: 0% of 1932 checklistsMar 1-7: 0% of 2486 checklistsMar 8-14: 0% of 2535 checklistsMar 15-21: 0.1% of 2726 checklistsMar 22-31: 0.1% of 4349 checklistsApr 1-7: 0.1% of 3300 checklistsApr 8-14: 0.4% of 3500 checklistsApr 15-21: 0.6% of 3701 checklistsApr 22-30: 0.7% of 5887 checklistsMay 1-7: 0.8% of 5341 checklistsMay 8-14: 0.9% of 6910 checklistsMay 15-21: 1.0% of 6884 checklistsMay 22-31: 1.3% of 10652 checklistsJun 1-7: 1.5% of 6807 checklistsJun 8-14: 1.8% of 6714 checklistsJun 15-21: 1.8% of 6708 checklistsJun 22-30: 1.9% of 8160 checklistsJul 1-7: 1.9% of 5755 checklistsJul 8-14: 1.4% of 5379 checklistsJul 15-21: 1.0% of 5299 checklistsJul 22-31: 0.7% of 6830 checklistsAug 1-7: 0.5% of 4581 checklistsAug 8-14: 0.2% of 4625 checklistsAug 15-21: 0.3% of 4466 checklistsAug 22-31: 0.4% of 6562 checklistsSep 1-7: 0.3% of 4543 checklistsSep 8-14: 0.3% of 4652 checklistsSep 15-21: 0.1% of 4186 checklistsSep 22-30: 0.2% of 5301 checklistsOct 1-7: 0% of 3248 checklistsOct 8-14: 0.2% of 3010 checklistsOct 15-21: 0.1% of 2624 checklistsOct 22-31: 0.1% of 3170 checklistsNov 1-7: 0% of 2110 checklistsNov 8-14: 0.1% of 2153 checklistsNov 15-21: 0.1% of 1971 checklistsNov 22-30: 0.1% of 2136 checklistsDec 1-7: 0.2% of 1646 checklistsDec 8-14: 0% of 1609 checklistsDec 15-21: 0.1% of 1954 checklistsDec 22-31: 0% 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. Lincoln CountyBest mid June · 118 checklists that week, 3,169 in all7.1%
  2. Sublette CountyBest the second week of June · 290 checklists that week, 6,738 in all6.7%
  3. Big Horn CountyBest late November · 17 checklists that week, 2,023 in all6.7%
  4. Carbon CountyBest early June · 276 checklists that week, 6,429 in all5.1%
  5. Teton CountyBest late June · 2194 checklists that week, 34,686 in all4.6%
  6. Campbell CountyBest early October · 59 checklists that week, 2,801 in all1.9%

Best spots

Share of checklists at the peak
  1. Christian Pond (Lunch Tree Hill)Teton County, best mid June · 23 checklists that week, 140 in all33%
  2. Woods CanyonTeton County, best late June · 22 checklists that week, 232 in all29%
  3. Grand Teton National Park (southwest)Teton County, best the second week of May · 26 checklists that week, 653 in all18%
  4. Blacktail PondsTeton County, best late June · 37 checklists that week, 338 in all18%
  5. Grand Teton National ParkTeton County, best early May · 35 checklists that week, 988 in all16%

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

Best time of day

In Wyoming, the Fox Sparrow is most often listed on checklists started between 6 and 8 am (1.1% of those checklists).

0%0.5%1%1.5%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: 1.2% of 8808 checklists7 am: 1.0% of 18458 checklists8 am: 1.0% of 22143 checklists9 am: 0.8% of 21499 checklists10 am: 0.7% of 19425 checklists11 am: 0.5% of 16017 checklists12 pm: 0.5% of 13868 checklists1 pm: 0.3% of 12984 checklists2 pm: 0.3% of 12605 checklists3 pm: 0.3% of 11821 checklists4 pm: 0.3% of 10571 checklists5 pm: 0.4% of 8746 checklists6 pm: 0.5% of 6707 checklists7 pm: 0.9% 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
January0%0%0%0%
February0%0%0%0%
March0%0%0.1%0.1%
April0.1%0.4%0.6%0.7%
May0.8%0.9%1.0%1.3%
June1.5%1.8%1.8%1.9%
July1.9%1.4%1.0%0.7%
August0.5%0.2%0.3%0.4%
September0.3%0.3%0.1%0.2%
October0%0.2%0.1%0.1%
November0%0.1%0.1%0.1%
December0.2%0%0.1%0%

Neighboring states

  • Colorado: arrives mid May, 4 weeks later than Wyoming
  • Utah: arrives early April, 2 weeks earlier than Wyoming
  • Montana: arrives early June, 6 weeks later than Wyoming
  • Idaho: arrives the second week of April, 1 week earlier than Wyoming

Common questions

When do Fox Sparrows arrive in Wyoming?
Fox Sparrows arrive in Wyoming in mid April, peak in late June (1.9% of checklists), and most are gone by late July.
When do Fox Sparrows leave Wyoming?
Most Fox Sparrows have left Wyoming by late July, when reports fall below half their usual rate.
When is the best time to see a Fox Sparrow in Wyoming?
The Fox Sparrow is reported most often in late June, on about 1.9% of Wyoming checklists.
Where in Wyoming are Fox Sparrows seen most often?
By county, Lincoln County, Sublette County, and Big Horn County have the highest peak reporting rates for the Fox Sparrow (counties with at least 200 checklists).