WhenToBird

Peucaea cassinii · Passerellidae

When Do Cassin's Sparrows Arrive in Oklahoma?

Adult Cassin's Sparrow
Photo: Dan Vickers, CC BY 4.0 via iNaturalist

Cassin's Sparrows arrive in Oklahoma in late April, peak in the second week of June (1.8% of checklists), and most are gone by early July.

When to look

First arrivalsApr 22-30late April
Common byApr 22-30late April
PeakJun 8-14the second week of June
Most gone byJul 1-7early July

Best: the second week of June. First arrivals late April; most are gone by early July. Peak: on about 1.8% of Oklahoma checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Apruncommon
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Auguncommon
  9. Sepuncommon
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%0.5%1%1.5%2%Jan 1-7: 0% of 6087 checklistsJan 8-14: 0% of 4350 checklistsJan 15-21: 0% of 4381 checklistsJan 22-31: 0% of 6165 checklistsFeb 1-7: 0% of 4259 checklistsFeb 8-14: 0% of 4589 checklistsFeb 15-21: 0% of 7001 checklistsFeb 22-28: 0% of 4482 checklistsMar 1-7: 0% of 4724 checklistsMar 8-14: 0.1% of 4571 checklistsMar 15-21: 0% of 4393 checklistsMar 22-31: 0% of 7544 checklistsApr 1-7: 0.1% of 5967 checklistsApr 8-14: 0.1% of 6543 checklistsApr 15-21: 0.3% of 7366 checklistsApr 22-30: 0.7% of 10618 checklistsMay 1-7: 0.9% of 8835 checklistsMay 8-14: 0.9% of 8247 checklistsMay 15-21: 1.4% of 6081 checklistsMay 22-31: 1.6% of 7283 checklistsJun 1-7: 1.9% of 4256 checklistsJun 8-14: 1.6% of 3774 checklistsJun 15-21: 1.8% of 3541 checklistsJun 22-30: 1.3% of 4159 checklistsJul 1-7: 0.7% of 3209 checklistsJul 8-14: 0.2% of 2916 checklistsJul 15-21: 0.5% of 2861 checklistsJul 22-31: 0.8% of 4146 checklistsAug 1-7: 0.4% of 3043 checklistsAug 8-14: 0.2% of 2839 checklistsAug 15-21: 0.3% of 3014 checklistsAug 22-31: 0.3% of 4759 checklistsSep 1-7: 0.3% of 3861 checklistsSep 8-14: 0.2% of 3748 checklistsSep 15-21: 0.2% of 3569 checklistsSep 22-30: 0.1% of 4830 checklistsOct 1-7: 0% of 3809 checklistsOct 8-14: 0% of 4142 checklistsOct 15-21: 0% of 3705 checklistsOct 22-31: 0% of 4738 checklistsNov 1-7: 0% of 3823 checklistsNov 8-14: 0% of 3849 checklistsNov 15-21: 0% of 3722 checklistsNov 22-30: 0% of 4795 checklistsDec 1-7: 0% of 3324 checklistsDec 8-14: 0% of 3574 checklistsDec 15-21: 0% of 3884 checklistsDec 22-31: 0% of 5774 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 Oklahoma 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 Oklahoma

Best counties

Share of checklists at the peak
  1. Harmon CountyBest mid June · 18 checklists that week, 340 in all40%
  2. Washita CountyBest the second week of May · 20 checklists that week, 404 in all32%
  3. Cimarron CountyBest late June · 97 checklists that week, 5,146 in all32%
  4. Beaver CountyBest late June · 31 checklists that week, 838 in all26%
  5. Texas CountyBest the second week of June · 27 checklists that week, 1,542 in all25%
  6. Ellis CountyBest mid May · 23 checklists that week, 357 in all24%

Best spots

Share of checklists at the peak
  1. Carl Etling Public Fishing AreaCimarron County, best late May · 40 checklists that week, 497 in all16%
  2. CLO Lands (Kenton)Cimarron County, best mid May · 21 checklists that week, 329 in all7.4%
  3. Lake Carl EtlingCimarron County, best early September · 27 checklists that week, 413 in all5.7%

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

Best time of day

In Oklahoma, the Cassin's Sparrow is most often listed on checklists started between 6 and 8 am (0.7% of those checklists).

0%0.5%1%1.5%2%12 am: too few checklists (91) to judge1 am: too few checklists (65) to judge2 am: too few checklists (73) to judge3 am: too few checklists (73) to judge4 am: too few checklists (100) to judge5 am: too few checklists (647) to judge6 am: 1.6% of 8353 checklists7 am: 0.4% of 24509 checklists8 am: 0.3% of 27848 checklists9 am: 0.4% of 25316 checklists10 am: 0.4% of 21161 checklists11 am: 0.3% of 18730 checklists12 pm: 0.3% of 16097 checklists1 pm: 0.3% of 14028 checklists2 pm: 0.4% of 13599 checklists3 pm: 0.3% of 14228 checklists4 pm: 0.2% of 14597 checklists5 pm: 0.2% of 12125 checklists6 pm: 0.2% of 9337 checklists7 pm: 0.3% of 6944 checklists8 pm: too few checklists (2403) to judge9 pm: too few checklists (459) to judge10 pm: too few checklists (226) to judge11 pm: too few checklists (141) 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%0%0%0%
February0%0%0%0%
March0%0.1%0%0%
April0.1%0.1%0.3%0.7%
May0.9%0.9%1.4%1.6%
June1.9%1.6%1.8%1.3%
July0.7%0.2%0.5%0.8%
August0.4%0.2%0.3%0.3%
September0.3%0.2%0.2%0.1%
October0%0%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Texas: arrives the second week of March, 6 weeks earlier than Oklahoma
  • New Mexico: arrives mid April, 1 week earlier than Oklahoma
  • Colorado: arrives early May, 1 week later than Oklahoma
  • Arizona: arrives the second week of July, 10 weeks later than Oklahoma

Common questions

When do Cassin's Sparrows arrive in Oklahoma?
Cassin's Sparrows arrive in Oklahoma in late April, peak in the second week of June (1.8% of checklists), and most are gone by early July.
When do Cassin's Sparrows leave Oklahoma?
Most Cassin's Sparrows have left Oklahoma by early July, when reports fall below half their usual rate.
When is the best time to see a Cassin's Sparrow in Oklahoma?
The Cassin's Sparrow is reported most often in the second week of June, on about 1.8% of Oklahoma checklists.
Where in Oklahoma are Cassin's Sparrows seen most often?
By county, Harmon County, Washita County, and Cimarron County have the highest peak reporting rates for the Cassin's Sparrow (counties with at least 200 checklists).