WhenToBird

Setophaga coronata · Parulidae

When Do Yellow-rumped Warblers Arrive in Montana?

Adult Yellow-rumped Warbler
Photo: Jonathan Eisen, CC BY 4.0 via iNaturalist

Yellow-rumped Warblers reach Montana in mid April, are common by late April, peak in late September (33% of checklists), and most are gone by the second week of October.

When to look

First arrivalsApr 15-21mid April
Common byApr 22-30late April
PeakSep 22-30late September
Most gone byOct 8-14the second week of October

Best: late September. First arrivals mid April; most are gone by the second week of October. Peak: on about 33% of Montana checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprcommon
  5. Maypeak season
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novrare
  12. Decnot usually seen

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

0%10%20%30%40%Jan 1-7: 0.1% of 7987 checklistsJan 8-14: 0.1% of 5561 checklistsJan 15-21: 0.1% of 5613 checklistsJan 22-31: 0.1% of 7881 checklistsFeb 1-7: 0.1% of 5018 checklistsFeb 8-14: 0.2% of 5598 checklistsFeb 15-21: 0.1% of 7247 checklistsFeb 22-28: 0.1% of 5531 checklistsMar 1-7: 0.1% of 6110 checklistsMar 8-14: 0.1% of 6623 checklistsMar 15-21: 0.1% of 7687 checklistsMar 22-31: 0.1% of 11095 checklistsApr 1-7: 0.1% of 7774 checklistsApr 8-14: 0.9% of 8785 checklistsApr 15-21: 3.5% of 9684 checklistsApr 22-30: 12% of 13805 checklistsMay 1-7: 23% of 11847 checklistsMay 8-14: 29% of 13547 checklistsMay 15-21: 31% of 13019 checklistsMay 22-31: 27% of 20456 checklistsJun 1-7: 21% of 12993 checklistsJun 8-14: 19% of 11594 checklistsJun 15-21: 19% of 11159 checklistsJun 22-30: 19% of 13786 checklistsJul 1-7: 21% of 9584 checklistsJul 8-14: 19% of 9078 checklistsJul 15-21: 15% of 7905 checklistsJul 22-31: 10% of 10906 checklistsAug 1-7: 8.2% of 7335 checklistsAug 8-14: 9.2% of 6868 checklistsAug 15-21: 12% of 6866 checklistsAug 22-31: 18% of 10076 checklistsSep 1-7: 26% of 7670 checklistsSep 8-14: 30% of 7490 checklistsSep 15-21: 35% of 6804 checklistsSep 22-30: 35% of 8016 checklistsOct 1-7: 29% of 5996 checklistsOct 8-14: 18% of 6156 checklistsOct 15-21: 7.9% of 5742 checklistsOct 22-31: 2.6% of 7790 checklistsNov 1-7: 0.6% of 5353 checklistsNov 8-14: 0.3% of 5475 checklistsNov 15-21: 0.3% of 4603 checklistsNov 22-30: 0.2% of 6067 checklistsDec 1-7: 0.2% of 4362 checklistsDec 8-14: 0.1% of 4467 checklistsDec 15-21: 0.2% of 5328 checklistsDec 22-31: 0.2% of 6672 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 Montana 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 Montana

Best counties

Share of checklists at the peak
  1. Sheridan CountyBest mid September · 34 checklists that week, 2,316 in all74%
  2. Valley CountyBest late September · 26 checklists that week, 3,392 in all68%
  3. Richland CountyBest late September · 12 checklists that week, 673 in all62%
  4. Daniels CountyBest the second week of September · 24 checklists that week, 481 in all59%
  5. Broadwater CountyBest mid September · 34 checklists that week, 2,470 in all54%
  6. Musselshell CountyBest mid September · 12 checklists that week, 961 in all53%

Best spots

Share of checklists at the peak
  1. Blue Mountain Nature National Recreation TrailMissoula County, best early June · 20 checklists that week, 177 in all96%
  2. Pattee Canyon Ski Tour National Recreation TrailMissoula County, best the second week of May · 21 checklists that week, 550 in all94%
  3. Giant Springs State ParkCascade County, best late September · 62 checklists that week, 1,249 in all85%

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

Best time of day

In Montana, the Yellow-rumped Warbler is most often listed on checklists started between 6 and 8 am (19% of those checklists).

0%10%20%30%12 am: too few checklists (183) to judge1 am: too few checklists (169) to judge2 am: too few checklists (163) to judge3 am: too few checklists (212) to judge4 am: too few checklists (503) to judge5 am: too few checklists (4022) to judge6 am: 22% of 12719 checklists7 am: 18% of 31202 checklists8 am: 15% of 47646 checklists9 am: 15% of 44624 checklists10 am: 14% of 40704 checklists11 am: 12% of 33825 checklists12 pm: 11% of 29407 checklists1 pm: 9.4% of 27959 checklists2 pm: 8.6% of 26928 checklists3 pm: 8.9% of 25313 checklists4 pm: 9.2% of 22151 checklists5 pm: 11% of 16884 checklists6 pm: 13% of 13780 checklists7 pm: 13% of 9926 checklists8 pm: too few checklists (5765) to judge9 pm: too few checklists (2099) to judge10 pm: too few checklists (595) to judge11 pm: too few checklists (230) 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
January0.1%0.1%0.1%0.1%
February0.1%0.2%0.1%0.1%
March0.1%0.1%0.1%0.1%
April0.1%0.9%3.5%12%
May23%29%31%27%
June21%19%19%19%
July21%19%15%10%
August8.2%9.2%12%18%
September26%30%35%35%
October29%18%7.9%2.6%
November0.6%0.3%0.3%0.2%
December0.2%0.1%0.2%0.2%

Neighboring states

  • Idaho: arrives the second week of September, 19 weeks later than Montana
  • Wyoming: arrives the second week of April, 1 week earlier than Montana
  • Utah: arrives mid September, 20 weeks later than Montana
  • Washington: arrives the second week of April, 1 week earlier than Montana

Common questions

When do Yellow-rumped Warblers arrive in Montana?
Yellow-rumped Warblers reach Montana in mid April, are common by late April, peak in late September (33% of checklists), and most are gone by the second week of October.
When do Yellow-rumped Warblers leave Montana?
Most Yellow-rumped Warblers have left Montana 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 a Yellow-rumped Warbler in Montana?
The Yellow-rumped Warbler is reported most often in late September, on about 33% of Montana checklists.
Where in Montana are Yellow-rumped Warblers seen most often?
By county, Sheridan County, Valley County, and Richland County have the highest peak reporting rates for the Yellow-rumped Warbler (counties with at least 200 checklists).