WhenToBird

Poecile gambeli · Paridae

When Do Mountain Chickadees Arrive in Idaho?

Adult Mountain Chickadee
Photo: Wendy McCrady, CC BY 4.0 via iNaturalist

Mountain Chickadees are in Idaho all year, but most are here in fall: numbers build from mid June, peak in late July (13% of checklists), and fall back by mid November. In the quietest week (late April) they are still on about 4.9% of checklists.

When to look

Numbers buildJun 15-21mid June
PeakJul 22-31late July
Fall back byNov 15-21mid November
FewestApr 22-30late April

Best: late July. Here all year; numbers build from mid June and fall back by mid November. Peak: on about 13% of Idaho checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Maycommon
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novcommon
  12. Deccommon

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

0%5%10%15%Jan 1-7: 7.8% of 9357 checklistsJan 8-14: 7.8% of 6408 checklistsJan 15-21: 8.1% of 6358 checklistsJan 22-31: 8.1% of 8601 checklistsFeb 1-7: 8.6% of 5611 checklistsFeb 8-14: 9.0% of 6090 checklistsFeb 15-21: 8.0% of 7973 checklistsFeb 22-28: 8.3% of 5866 checklistsMar 1-7: 7.9% of 6144 checklistsMar 8-14: 8.0% of 6456 checklistsMar 15-21: 6.8% of 6786 checklistsMar 22-31: 6.2% of 9539 checklistsApr 1-7: 5.7% of 7202 checklistsApr 8-14: 4.9% of 7608 checklistsApr 15-21: 5.0% of 8069 checklistsApr 22-30: 4.9% of 10973 checklistsMay 1-7: 4.7% of 9481 checklistsMay 8-14: 5.2% of 11318 checklistsMay 15-21: 5.9% of 9141 checklistsMay 22-31: 6.3% of 13984 checklistsJun 1-7: 7.7% of 8897 checklistsJun 8-14: 8.0% of 8504 checklistsJun 15-21: 9.2% of 8078 checklistsJun 22-30: 9.9% of 9665 checklistsJul 1-7: 9.8% of 7144 checklistsJul 8-14: 11% of 6557 checklistsJul 15-21: 13% of 6430 checklistsJul 22-31: 14% of 8696 checklistsAug 1-7: 12% of 5896 checklistsAug 8-14: 12% of 5643 checklistsAug 15-21: 12% of 6151 checklistsAug 22-31: 11% of 7863 checklistsSep 1-7: 11% of 5769 checklistsSep 8-14: 11% of 5646 checklistsSep 15-21: 11% of 5460 checklistsSep 22-30: 14% of 6363 checklistsOct 1-7: 12% of 4980 checklistsOct 8-14: 11% of 5096 checklistsOct 15-21: 10% of 4878 checklistsOct 22-31: 9.9% of 6426 checklistsNov 1-7: 8.9% of 4822 checklistsNov 8-14: 9.3% of 4999 checklistsNov 15-21: 8.9% of 4601 checklistsNov 22-30: 8.6% of 6027 checklistsDec 1-7: 8.7% of 4180 checklistsDec 8-14: 8.0% of 4775 checklistsDec 15-21: 7.8% of 6522 checklistsDec 22-31: 7.6% of 7792 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 Idaho 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 Idaho

Best counties

Share of checklists at the peak
  1. Adams CountyBest late January · 137 checklists that week, 5,826 in all85%
  2. Bear Lake CountyBest mid February · 10 checklists that week, 1,581 in all67%
  3. Valley CountyBest mid February · 182 checklists that week, 8,991 in all54%
  4. Cassia CountyBest early August · 274 checklists that week, 9,223 in all43%
  5. Custer CountyBest mid February · 12 checklists that week, 3,853 in all40%
  6. Boise CountyBest late July · 255 checklists that week, 6,761 in all34%

Best spots

Share of checklists at the peak
  1. Fall CreekValley County, best mid March · 20 checklists that week, 539 in all94%
  2. Sawtooth National ForestCassia County, best early August · 39 checklists that week, 885 in all87%
  3. Sawtooth National Forest (Little Fork Spring)Cassia County, best the second week of August · 20 checklists that week, 406 in all83%
  4. Bogus Basin State ParkBoise County, best late July · 27 checklists that week, 339 in all59%
  5. Lake ClevelandCassia County, best early August · 21 checklists that week, 110 in all55%
  6. Morley Nelson Snake River Birds of Prey National Conservation Area (Swan Falls)Ada County, best late September · 41 checklists that week, 825 in all54%

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

Best time of day

In Idaho, the Mountain Chickadee is most often listed on checklists started between 7 and 9 am (15% of those checklists).

0%5%10%15%20%12 am: too few checklists (180) to judge1 am: too few checklists (176) to judge2 am: too few checklists (169) to judge3 am: too few checklists (164) to judge4 am: too few checklists (450) to judge5 am: too few checklists (2270) to judge6 am: 14% of 9122 checklists7 am: 12% of 22204 checklists8 am: 17% of 38672 checklists9 am: 9.1% of 38930 checklists10 am: 8.4% of 37338 checklists11 am: 7.5% of 33508 checklists12 pm: 6.8% of 28544 checklists1 pm: 6.3% of 25774 checklists2 pm: 5.9% of 24296 checklists3 pm: 5.5% of 21784 checklists4 pm: 5.4% of 19051 checklists5 pm: 5.4% of 14150 checklists6 pm: 5.3% of 10014 checklists7 pm: 4.3% of 7495 checklists8 pm: too few checklists (4352) to judge9 pm: too few checklists (1449) to judge10 pm: too few checklists (525) to judge11 pm: too few checklists (208) 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
January7.8%7.8%8.1%8.1%
February8.6%9.0%8.0%8.3%
March7.9%8.0%6.8%6.2%
April5.7%4.9%5.0%4.9%
May4.7%5.2%5.9%6.3%
June7.7%8.0%9.2%9.9%
July9.8%11%13%14%
August12%12%12%11%
September11%11%11%14%
October12%11%10%9.9%
November8.9%9.3%8.9%8.6%
December8.7%8.0%7.8%7.6%

Neighboring states

  • Montana: year-round, peaks mid December
  • Utah: arrives mid June, in the same week than Idaho
  • Oregon: year-round, peaks late June
  • Washington: year-round, peaks late June

Common questions

When do Mountain Chickadees arrive in Idaho?
Mountain Chickadees are in Idaho all year, but most are here in fall: numbers build from mid June, peak in late July (13% of checklists), and fall back by mid November. In the quietest week (late April) they are still on about 4.9% of checklists.
When do Mountain Chickadees leave Idaho?
Mountain Chickadees never fully leave Idaho: numbers fall back below half their usual rate by mid November, but some are still reported in every week, about 4.9% of checklists at the low.
When is the best time to see a Mountain Chickadee in Idaho?
The Mountain Chickadee is reported most often in late July, on about 13% of Idaho checklists.
Where in Idaho are Mountain Chickadees seen most often?
By county, Adams County, Bear Lake County, and Valley County have the highest peak reporting rates for the Mountain Chickadee (counties with at least 200 checklists).