WhenToBird

Falco peregrinus · Falconidae

When Do Peregrine Falcons Arrive in Alaska?

Adult Peregrine Falcon
Photo: Andrea Poggi, CC BY 4.0 via iNaturalist

Peregrine Falcons arrive in Alaska in the second week of April, peak in the second week of September (2.7% of checklists), and most are gone by mid October.

When to look

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

Best: the second week of September. First arrivals the second week of April; most are gone by mid October. Peak: on about 2.7% of Alaska checklists.

  1. Janrare
  2. Febnot usually seen
  3. Marrare
  4. Apruncommon
  5. Mayuncommon
  6. Jununcommon
  7. Juluncommon
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novrare
  12. Decrare

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

0%1%2%3%4%Jan 1-7: 0.1% of 3788 checklistsJan 8-14: 0.4% of 2852 checklistsJan 15-21: 0.2% of 2810 checklistsJan 22-31: 0.2% of 3629 checklistsFeb 1-7: 0.1% of 2519 checklistsFeb 8-14: 0% of 2927 checklistsFeb 15-21: 0.2% of 3743 checklistsFeb 22-28: 0.1% of 2846 checklistsMar 1-7: 0% of 2904 checklistsMar 8-14: 0.1% of 3073 checklistsMar 15-21: 0.2% of 3359 checklistsMar 22-31: 0.1% of 5855 checklistsApr 1-7: 0.1% of 4329 checklistsApr 8-14: 0.4% of 4949 checklistsApr 15-21: 0.7% of 7114 checklistsApr 22-30: 0.8% of 10916 checklistsMay 1-7: 0.9% of 11827 checklistsMay 8-14: 0.7% of 14115 checklistsMay 15-21: 0.6% of 12152 checklistsMay 22-31: 0.6% of 19919 checklistsJun 1-7: 0.6% of 15816 checklistsJun 8-14: 0.6% of 17194 checklistsJun 15-21: 0.7% of 15943 checklistsJun 22-30: 0.8% of 16192 checklistsJul 1-7: 0.8% of 9815 checklistsJul 8-14: 0.8% of 8263 checklistsJul 15-21: 1.0% of 7081 checklistsJul 22-31: 1.0% of 9434 checklistsAug 1-7: 1.1% of 6380 checklistsAug 8-14: 1.7% of 6258 checklistsAug 15-21: 1.9% of 6114 checklistsAug 22-31: 2.6% of 8189 checklistsSep 1-7: 3.1% of 5848 checklistsSep 8-14: 2.3% of 4853 checklistsSep 15-21: 2.6% of 4415 checklistsSep 22-30: 2.4% of 5086 checklistsOct 1-7: 1.2% of 3576 checklistsOct 8-14: 0.5% of 4212 checklistsOct 15-21: 0.5% of 3339 checklistsOct 22-31: 0.4% of 4169 checklistsNov 1-7: 0.1% of 2844 checklistsNov 8-14: 0.1% of 2753 checklistsNov 15-21: 0.6% of 2291 checklistsNov 22-30: 0.2% of 3066 checklistsDec 1-7: 0.1% of 2199 checklistsDec 8-14: 0.5% of 2472 checklistsDec 15-21: 0.3% of 3071 checklistsDec 22-31: 0.2% 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. Aleutians West Census AreaBest mid October · 27 checklists that week, 6,087 in all12%
  2. Yukon-Koyukuk Census AreaBest late August · 33 checklists that week, 2,835 in all11%
  3. Chugach Census AreaBest early October · 94 checklists that week, 7,540 in all7.8%
  4. Nome Census AreaBest early September · 270 checklists that week, 13,472 in all7.1%
  5. Kusilvak Census AreaBest late July · 14 checklists that week, 573 in all6.9%
  6. Aleutians East BoroughBest the second week of August · 23 checklists that week, 1,634 in all6.3%

Best spots

Share of checklists at the peak
  1. Middleton IslandChugach Census Area, best late September · 44 checklists that week, 269 in all31%
  2. Creamer's FieldFairbanks North Star Borough, best early September · 46 checklists that week, 2,118 in all18%
  3. Creamer's Field (north)Fairbanks North Star Borough, best late August · 23 checklists that week, 315 in all18%
  4. Campbell Creek Estuary (Campbell Reservoir)Anchorage Municipality, best the second week of August · 20 checklists that week, 296 in all16%

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

Best time of day

In Alaska, the Peregrine Falcon is most often listed on checklists started between 10 am and 12 pm (0.9% of those checklists).

0%0.5%1%1.5%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: 0.6% of 9751 checklists7 am: 0.6% of 17236 checklists8 am: 0.7% of 24936 checklists9 am: 0.8% of 30139 checklists10 am: 1.0% of 30866 checklists11 am: 0.9% of 28207 checklists12 pm: 0.8% of 25650 checklists1 pm: 0.8% of 24144 checklists2 pm: 0.8% of 23323 checklists3 pm: 1.0% of 20763 checklists4 pm: 0.8% of 18245 checklists5 pm: 0.8% of 14895 checklists6 pm: 0.9% of 11707 checklists7 pm: 0.9% of 9365 checklists8 pm: 0.7% 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
January0.1%0.4%0.2%0.2%
February0.1%0%0.2%0.1%
March0%0.1%0.2%0.1%
April0.1%0.4%0.7%0.8%
May0.9%0.7%0.6%0.6%
June0.6%0.6%0.7%0.8%
July0.8%0.8%1.0%1.0%
August1.1%1.7%1.9%2.6%
September3.1%2.3%2.6%2.4%
October1.2%0.5%0.5%0.4%
November0.1%0.1%0.6%0.2%
December0.1%0.5%0.3%0.2%

Neighboring states

  • Washington: arrives the second week of July, 12 weeks later than Alaska
  • Oregon: arrives mid June, 9 weeks later than Alaska
  • Idaho: arrives late January, 10 weeks earlier than Alaska
  • Montana: arrives late March, 2 weeks earlier than Alaska

Common questions

When do Peregrine Falcons arrive in Alaska?
Peregrine Falcons arrive in Alaska in the second week of April, peak in the second week of September (2.7% of checklists), and most are gone by mid October.
When do Peregrine Falcons leave Alaska?
Most Peregrine Falcons have left Alaska by mid October, when reports fall below half their usual rate.
When is the best time to see a Peregrine Falcon in Alaska?
The Peregrine Falcon is reported most often in the second week of September, on about 2.7% of Alaska checklists.
Where in Alaska are Peregrine Falcons seen most often?
By county, Aleutians West Census Area, Yukon-Koyukuk Census Area, and Chugach Census Area have the highest peak reporting rates for the Peregrine Falcon (counties with at least 200 checklists).