WhenToBird

Sitta pygmaea · Sittidae

When Do Pygmy Nuthatches Arrive in Colorado?

Adult Pygmy Nuthatch
Photo: Casey H. Richart, CC BY 4.0 via iNaturalist

The Pygmy Nuthatch is in Colorado all year. It turns up on about 9.4% of checklists at its peak (the second week of August) and on 4.4% in its quietest week (late April).

When to look

PresentAll year
Peak weekAug 8-14the second week of August
Quietest weekApr 22-30late April

Best: the second week of August. Here all year. Peak: on about 9.4% of Colorado 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%Jan 1-7: 5.4% of 32254 checklistsJan 8-14: 5.5% of 23278 checklistsJan 15-21: 5.6% of 22933 checklistsJan 22-31: 5.8% of 30856 checklistsFeb 1-7: 5.4% of 21464 checklistsFeb 8-14: 5.9% of 22910 checklistsFeb 15-21: 6.6% of 28739 checklistsFeb 22-28: 5.7% of 21833 checklistsMar 1-7: 5.7% of 23066 checklistsMar 8-14: 5.7% of 23783 checklistsMar 15-21: 5.2% of 24797 checklistsMar 22-31: 5.1% of 38439 checklistsApr 1-7: 5.2% of 31676 checklistsApr 8-14: 5.3% of 35092 checklistsApr 15-21: 4.5% of 36778 checklistsApr 22-30: 4.5% of 50885 checklistsMay 1-7: 4.3% of 44186 checklistsMay 8-14: 4.8% of 49011 checklistsMay 15-21: 5.6% of 40784 checklistsMay 22-31: 5.9% of 53073 checklistsJun 1-7: 6.0% of 32432 checklistsJun 8-14: 6.4% of 29978 checklistsJun 15-21: 6.3% of 29457 checklistsJun 22-30: 7.6% of 36072 checklistsJul 1-7: 8.3% of 28857 checklistsJul 8-14: 8.6% of 27224 checklistsJul 15-21: 9.3% of 27629 checklistsJul 22-31: 9.1% of 37318 checklistsAug 1-7: 9.1% of 25893 checklistsAug 8-14: 9.8% of 24870 checklistsAug 15-21: 9.4% of 24035 checklistsAug 22-31: 8.6% of 35691 checklistsSep 1-7: 8.4% of 27068 checklistsSep 8-14: 7.6% of 26709 checklistsSep 15-21: 8.0% of 26098 checklistsSep 22-30: 7.8% of 31550 checklistsOct 1-7: 9.5% of 24110 checklistsOct 8-14: 7.2% of 23352 checklistsOct 15-21: 6.6% of 21895 checklistsOct 22-31: 5.9% of 28319 checklistsNov 1-7: 5.8% of 21698 checklistsNov 8-14: 5.1% of 21061 checklistsNov 15-21: 5.5% of 19855 checklistsNov 22-30: 5.6% of 25798 checklistsDec 1-7: 4.8% of 18626 checklistsDec 8-14: 6.1% of 19004 checklistsDec 15-21: 6.0% of 23103 checklistsDec 22-31: 6.5% 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. Lake CountyBest mid December · 14 checklists that week, 2,361 in all61%
  2. Teller CountyBest mid December · 72 checklists that week, 11,258 in all57%
  3. Gilpin CountyBest late February · 29 checklists that week, 4,252 in all48%
  4. Elbert CountyBest early December · 41 checklists that week, 5,660 in all44%
  5. Custer CountyBest the second week of February · 17 checklists that week, 3,017 in all42%
  6. Park CountyBest the second week of March · 102 checklists that week, 11,432 in all33%

Best spots

Share of checklists at the peak
  1. Genesee ParkJefferson County, best late April · 24 checklists that week, 1,068 in all95%
  2. Lookout Mountain Nature Center and PreserveJefferson County, best late June · 23 checklists that week, 309 in all94%
  3. Staunton State ParkJefferson County, best the second week of April · 20 checklists that week, 869 in all92%
  4. Prospect Lake (south)El Paso County, best early December · 20 checklists that week, 472 in all91%
  5. Betasso PreserveBoulder County, best the second week of June · 20 checklists that week, 358 in all90%

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

Best time of day

In Colorado, the Pygmy Nuthatch is most often listed on checklists started between 6 and 8 am (8.8% of those checklists).

0%5%10%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: 8.1% of 71991 checklists7 am: 9.1% of 159189 checklists8 am: 8.0% of 177206 checklists9 am: 7.1% of 165269 checklists10 am: 6.5% of 141029 checklists11 am: 5.8% of 115283 checklists12 pm: 5.5% of 96068 checklists1 pm: 5.4% of 89512 checklists2 pm: 5.2% of 86319 checklists3 pm: 5.0% of 82496 checklists4 pm: 4.7% of 71648 checklists5 pm: 4.7% of 52445 checklists6 pm: 4.2% 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
January5.4%5.5%5.6%5.8%
February5.4%5.9%6.6%5.7%
March5.7%5.7%5.2%5.1%
April5.2%5.3%4.5%4.5%
May4.3%4.8%5.6%5.9%
June6.0%6.4%6.3%7.6%
July8.3%8.6%9.3%9.1%
August9.1%9.8%9.4%8.6%
September8.4%7.6%8.0%7.8%
October9.5%7.2%6.6%5.9%
November5.8%5.1%5.5%5.6%
December4.8%6.1%6.0%6.5%

Neighboring states

  • Wyoming: winter visitor, peaks mid December
  • New Mexico: year-round, peaks the second week of July
  • Utah: winter visitor, peaks the second week of October
  • Nebraska: summer visitor, peaks the second week of June

Common questions

When do Pygmy Nuthatches arrive in Colorado?
The Pygmy Nuthatch is in Colorado all year. It turns up on about 9.4% of checklists at its peak (the second week of August) and on 4.4% in its quietest week (late April).
When do Pygmy Nuthatches leave Colorado?
The Pygmy Nuthatch does not leave Colorado: it is reported all year, from 4.4% of checklists in late April to 9.4% in the second week of August.
When is the best time to see a Pygmy Nuthatch in Colorado?
The Pygmy Nuthatch is reported most often in the second week of August, on about 9.4% of Colorado checklists.
Where in Colorado are Pygmy Nuthatches seen most often?
By county, Lake County, Teller County, and Gilpin County have the highest peak reporting rates for the Pygmy Nuthatch (counties with at least 200 checklists).