WhenToBird

Buteo jamaicensis · Accipitridae

When Do Red-tailed Hawks Arrive in Colorado?

Adult Red-tailed Hawk
Photo: Catherine C. Galley, CC BY 4.0 via iNaturalist

The Red-tailed Hawk is in Colorado all year. It turns up on about 28% of checklists at its peak (mid March) and on 15% in its quietest week (early July).

When to look

PresentAll year
Peak weekMar 15-21mid March
Quietest weekJul 1-7early July

Best: mid March. Here all year. Peak: on about 28% of Colorado checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%10%20%30%Jan 1-7: 25% of 32254 checklistsJan 8-14: 25% of 23278 checklistsJan 15-21: 26% of 22933 checklistsJan 22-31: 25% of 30856 checklistsFeb 1-7: 25% of 21464 checklistsFeb 8-14: 22% of 22910 checklistsFeb 15-21: 21% of 28739 checklistsFeb 22-28: 25% of 21833 checklistsMar 1-7: 26% of 23066 checklistsMar 8-14: 27% of 23783 checklistsMar 15-21: 28% of 24797 checklistsMar 22-31: 29% of 38439 checklistsApr 1-7: 26% of 31676 checklistsApr 8-14: 25% of 35092 checklistsApr 15-21: 24% of 36778 checklistsApr 22-30: 24% of 50885 checklistsMay 1-7: 23% of 44186 checklistsMay 8-14: 22% of 49011 checklistsMay 15-21: 21% of 40784 checklistsMay 22-31: 21% of 53073 checklistsJun 1-7: 19% of 32432 checklistsJun 8-14: 17% of 29978 checklistsJun 15-21: 16% of 29457 checklistsJun 22-30: 15% of 36072 checklistsJul 1-7: 16% of 28857 checklistsJul 8-14: 14% of 27224 checklistsJul 15-21: 15% of 27629 checklistsJul 22-31: 16% of 37318 checklistsAug 1-7: 17% of 25893 checklistsAug 8-14: 17% of 24870 checklistsAug 15-21: 17% of 24035 checklistsAug 22-31: 18% of 35691 checklistsSep 1-7: 18% of 27068 checklistsSep 8-14: 19% of 26709 checklistsSep 15-21: 20% of 26098 checklistsSep 22-30: 21% of 31550 checklistsOct 1-7: 22% of 24110 checklistsOct 8-14: 22% of 23352 checklistsOct 15-21: 23% of 21895 checklistsOct 22-31: 23% of 28319 checklistsNov 1-7: 24% of 21698 checklistsNov 8-14: 24% of 21061 checklistsNov 15-21: 24% of 19855 checklistsNov 22-30: 24% of 25798 checklistsDec 1-7: 25% of 18626 checklistsDec 8-14: 25% of 19004 checklistsDec 15-21: 26% of 23103 checklistsDec 22-31: 24% of 30802 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 Colorado 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 Colorado

Best counties

Share of checklists at the peak
  1. Conejos CountyBest late December · 13 checklists that week, 1,636 in all53%
  2. Sedgwick CountyBest the second week of March · 25 checklists that week, 1,168 in all52%
  3. Morgan CountyBest the second week of November · 66 checklists that week, 5,181 in all49%
  4. Adams CountyBest the second week of January · 805 checklists that week, 44,639 in all47%
  5. Otero CountyBest the second week of December · 49 checklists that week, 4,404 in all44%
  6. Logan CountyBest late October · 33 checklists that week, 4,117 in all44%

Best spots

Share of checklists at the peak
  1. Carbondale Nature ParkGarfield County, best late January · 23 checklists that week, 342 in all93%
  2. Verbena ParkDenver County, best early December · 27 checklists that week, 1,299 in all93%
  3. Dry CreekBoulder County, best the second week of January · 29 checklists that week, 2,413 in all92%
  4. Rocky Mountain Arsenal National Wildlife Refuge (east)Adams County, best early January · 24 checklists that week, 560 in all91%
  5. CollinsWeld County, best late February · 22 checklists that week, 990 in all91%
  6. Matthews/Winters ParkJefferson County, best mid March · 34 checklists that week, 502 in all90%

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

Best time of day

In Colorado, the Red-tailed Hawk is most often listed on checklists started between 9 and 11 am (25% of those checklists).

0%10%20%30%12 am: too few checklists (512) to judge1 am: too few checklists (468) to judge2 am: too few checklists (513) to judge3 am: too few checklists (656) to judge4 am: too few checklists (1918) to judge5 am: too few checklists (16045) to judge6 am: 17% of 71991 checklists7 am: 19% of 159189 checklists8 am: 23% of 177206 checklists9 am: 25% of 165269 checklists10 am: 25% of 141029 checklists11 am: 25% of 115283 checklists12 pm: 24% of 96068 checklists1 pm: 24% of 89512 checklists2 pm: 24% of 86319 checklists3 pm: 22% of 82496 checklists4 pm: 20% of 71648 checklists5 pm: 18% of 52445 checklists6 pm: 14% of 40199 checklists7 pm: too few checklists (24246) to judge8 pm: too few checklists (7986) to judge9 pm: too few checklists (2004) to judge10 pm: too few checklists (888) to judge11 pm: too few checklists (450) 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
January25%25%26%25%
February25%22%21%25%
March26%27%28%29%
April26%25%24%24%
May23%22%21%21%
June19%17%16%15%
July16%14%15%16%
August17%17%17%18%
September18%19%20%21%
October22%22%23%23%
November24%24%24%24%
December25%25%26%24%

Neighboring states

  • Wyoming: year-round, peaks early April
  • New Mexico: all year, most in winter, peaks the second week of January
  • Utah: year-round, peaks early January
  • Nebraska: year-round, peaks late October

Common questions

When do Red-tailed Hawks arrive in Colorado?
The Red-tailed Hawk is in Colorado all year. It turns up on about 28% of checklists at its peak (mid March) and on 15% in its quietest week (early July).
When do Red-tailed Hawks leave Colorado?
The Red-tailed Hawk does not leave Colorado: it is reported all year, from 15% of checklists in early July to 28% in mid March.
When is the best time to see a Red-tailed Hawk in Colorado?
The Red-tailed Hawk is reported most often in mid March, on about 28% of Colorado checklists.
Where in Colorado are Red-tailed Hawks seen most often?
By county, Conejos County, Sedgwick County, and Morgan County have the highest peak reporting rates for the Red-tailed Hawk (counties with at least 200 checklists).