WhenToBird

Poecile hudsonicus · Paridae

When Do Boreal Chickadees Arrive in Alaska?

Adult Boreal Chickadee
Photo: Sean Frey, CC BY 4.0 via iNaturalist

Boreal Chickadees are in Alaska all year, but most are here in winter: numbers build from late October, peak in mid February (15% of checklists), and fall back by late March. In the quietest week (early June) they are still on about 4.0% of checklists.

When to look

Numbers buildOct 22-31late October
PeakFeb 15-21mid February
Fall back byMar 22-31late March
FewestJun 1-7early June

Best: mid February. Here all year; numbers build from late October and fall back by late March. Peak: on about 15% of Alaska checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprcommon
  5. Mayuncommon
  6. Jununcommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%20%Jan 1-7: 13% of 3788 checklistsJan 8-14: 14% of 2852 checklistsJan 15-21: 15% of 2810 checklistsJan 22-31: 15% of 3629 checklistsFeb 1-7: 15% of 2519 checklistsFeb 8-14: 15% of 2927 checklistsFeb 15-21: 16% of 3743 checklistsFeb 22-28: 15% of 2846 checklistsMar 1-7: 13% of 2904 checklistsMar 8-14: 12% of 3073 checklistsMar 15-21: 14% of 3359 checklistsMar 22-31: 11% of 5855 checklistsApr 1-7: 9.1% of 4329 checklistsApr 8-14: 8.0% of 4949 checklistsApr 15-21: 6.5% of 7114 checklistsApr 22-30: 6.0% of 10916 checklistsMay 1-7: 6.1% of 11827 checklistsMay 8-14: 6.0% of 14115 checklistsMay 15-21: 5.0% of 12152 checklistsMay 22-31: 4.1% of 19919 checklistsJun 1-7: 3.5% of 15816 checklistsJun 8-14: 4.5% of 17194 checklistsJun 15-21: 4.5% of 15943 checklistsJun 22-30: 4.9% of 16192 checklistsJul 1-7: 5.5% of 9815 checklistsJul 8-14: 7.1% of 8263 checklistsJul 15-21: 7.0% of 7081 checklistsJul 22-31: 7.9% of 9434 checklistsAug 1-7: 8.1% of 6380 checklistsAug 8-14: 9.3% of 6258 checklistsAug 15-21: 9.8% of 6114 checklistsAug 22-31: 11% of 8189 checklistsSep 1-7: 10% of 5848 checklistsSep 8-14: 9.6% of 4853 checklistsSep 15-21: 9.5% of 4415 checklistsSep 22-30: 9.9% of 5086 checklistsOct 1-7: 9.1% of 3576 checklistsOct 8-14: 9.3% of 4212 checklistsOct 15-21: 9.6% of 3339 checklistsOct 22-31: 10% of 4169 checklistsNov 1-7: 11% of 2844 checklistsNov 8-14: 10% of 2753 checklistsNov 15-21: 11% of 2291 checklistsNov 22-30: 13% of 3066 checklistsDec 1-7: 12% of 2199 checklistsDec 8-14: 12% of 2472 checklistsDec 15-21: 13% of 3071 checklistsDec 22-31: 12% of 3442 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 Alaska 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 Alaska

Best counties

Share of checklists at the peak
  1. Southeast Fairbanks Census AreaBest the second week of December · 14 checklists that week, 3,009 in all90%
  2. Dillingham Census AreaBest mid December · 14 checklists that week, 1,426 in all88%
  3. Denali BoroughBest late March · 22 checklists that week, 6,287 in all74%
  4. Fairbanks North Star BoroughBest mid November · 120 checklists that week, 23,771 in all64%
  5. Yukon-Koyukuk Census AreaBest mid January · 11 checklists that week, 2,835 in all61%
  6. Copper River Census AreaBest the second week of March · 21 checklists that week, 3,467 in all46%

Best spots

Share of checklists at the peak
  1. Smith LakeFairbanks North Star Borough, best early September · 27 checklists that week, 412 in all75%
  2. Horseshoe LakeDenali Borough, best mid August · 23 checklists that week, 475 in all73%
  3. Hillside ParkAnchorage Municipality, best mid June · 20 checklists that week, 338 in all62%
  4. Kasilof RiverKenai Peninsula Borough, best late September · 33 checklists that week, 929 in all39%

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

Best time of day

In Alaska, the Boreal Chickadee is most often listed on checklists started between 9 and 11 am (9.1% of those checklists).

0%5%10%12 am: too few checklists (549) to judge1 am: too few checklists (365) to judge2 am: too few checklists (291) to judge3 am: too few checklists (624) to judge4 am: too few checklists (1241) to judge5 am: too few checklists (3532) to judge6 am: 8.4% of 9751 checklists7 am: 8.2% of 17236 checklists8 am: 8.8% of 24936 checklists9 am: 9.0% of 30139 checklists10 am: 9.3% of 30866 checklists11 am: 8.6% of 28207 checklists12 pm: 8.8% of 25650 checklists1 pm: 8.4% of 24144 checklists2 pm: 8.5% of 23323 checklists3 pm: 7.5% of 20763 checklists4 pm: 7.0% of 18245 checklists5 pm: 6.7% of 14895 checklists6 pm: 5.3% of 11707 checklists7 pm: 4.5% of 9365 checklists8 pm: 2.9% of 6934 checklists9 pm: too few checklists (4176) to judge10 pm: too few checklists (2050) to judge11 pm: too few checklists (952) 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
January13%14%15%15%
February15%15%16%15%
March13%12%14%11%
April9.1%8.0%6.5%6.0%
May6.1%6.0%5.0%4.1%
June3.5%4.5%4.5%4.9%
July5.5%7.1%7.0%7.9%
August8.1%9.3%9.8%11%
September10%9.6%9.5%9.9%
October9.1%9.3%9.6%10%
November11%10%11%13%
December12%12%13%12%

Neighboring states

  • Minnesota: arrives mid December, 7 weeks later than Alaska
  • New Hampshire: arrives late May, 20 weeks earlier than Alaska

Common questions

When do Boreal Chickadees arrive in Alaska?
Boreal Chickadees are in Alaska all year, but most are here in winter: numbers build from late October, peak in mid February (15% of checklists), and fall back by late March. In the quietest week (early June) they are still on about 4.0% of checklists.
When do Boreal Chickadees leave Alaska?
Boreal Chickadees never fully leave Alaska: numbers fall back below half their usual rate by late March, but some are still reported in every week, about 4.0% of checklists at the low.
When is the best time to see a Boreal Chickadee in Alaska?
The Boreal Chickadee is reported most often in mid February, on about 15% of Alaska checklists.
Where in Alaska are Boreal Chickadees seen most often?
By county, Southeast Fairbanks Census Area, Dillingham Census Area, and Denali Borough have the highest peak reporting rates for the Boreal Chickadee (counties with at least 200 checklists).