WhenToBird

Euphagus cyanocephalus · Icteridae

When Do Brewer's Blackbirds Arrive in Oklahoma?

Adult Brewer's Blackbird
Photo: William Harmon, CC BY 4.0 via iNaturalist

Brewer's Blackbirds arrive in Oklahoma in early November, peak in early April (2.1% of checklists), and most are gone by late April.

When to look

First arrivalsNov 1-7early November
Common byNov 1-7early November
PeakApr 1-7early April
Most gone byApr 22-30late April

Best: early April. First arrivals early November; most are gone by late April. Peak: on about 2.1% of Oklahoma checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Mayuncommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Seprare
  10. Octuncommon
  11. Novpeak season
  12. Decpeak season

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

0%1%2%3%Jan 1-7: 2.2% of 6087 checklistsJan 8-14: 1.7% of 4350 checklistsJan 15-21: 1.9% of 4381 checklistsJan 22-31: 1.4% of 6165 checklistsFeb 1-7: 1.4% of 4259 checklistsFeb 8-14: 1.4% of 4589 checklistsFeb 15-21: 1.7% of 7001 checklistsFeb 22-28: 1.3% of 4482 checklistsMar 1-7: 1.8% of 4724 checklistsMar 8-14: 1.4% of 4571 checklistsMar 15-21: 1.3% of 4393 checklistsMar 22-31: 2.0% of 7544 checklistsApr 1-7: 2.3% of 5967 checklistsApr 8-14: 2.1% of 6543 checklistsApr 15-21: 1.7% of 7366 checklistsApr 22-30: 0.9% of 10618 checklistsMay 1-7: 0.1% of 8835 checklistsMay 8-14: 0% of 8247 checklistsMay 15-21: 0% of 6081 checklistsMay 22-31: 0% of 7283 checklistsJun 1-7: 0% of 4256 checklistsJun 8-14: 0% of 3774 checklistsJun 15-21: 0% of 3541 checklistsJun 22-30: 0% of 4159 checklistsJul 1-7: 0% of 3209 checklistsJul 8-14: 0% of 2916 checklistsJul 15-21: 0% of 2861 checklistsJul 22-31: 0% of 4146 checklistsAug 1-7: 0% of 3043 checklistsAug 8-14: 0% of 2839 checklistsAug 15-21: 0% of 3014 checklistsAug 22-31: 0% of 4759 checklistsSep 1-7: 0% of 3861 checklistsSep 8-14: 0.1% of 3748 checklistsSep 15-21: 0.2% of 3569 checklistsSep 22-30: 0.2% of 4830 checklistsOct 1-7: 0.3% of 3809 checklistsOct 8-14: 0.3% of 4142 checklistsOct 15-21: 0.4% of 3705 checklistsOct 22-31: 0.5% of 4738 checklistsNov 1-7: 1.4% of 3823 checklistsNov 8-14: 1.8% of 3849 checklistsNov 15-21: 1.5% of 3722 checklistsNov 22-30: 2.1% of 4795 checklistsDec 1-7: 1.5% of 3324 checklistsDec 8-14: 1.8% of 3574 checklistsDec 15-21: 2.1% of 3884 checklistsDec 22-31: 1.7% 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. Atoka CountyBest mid December · 15 checklists that week, 381 in all48%
  2. Harmon CountyBest the second week of March · 10 checklists that week, 340 in all36%
  3. Hughes CountyBest early April · 23 checklists that week, 494 in all24%
  4. Tillman CountyBest late March · 61 checklists that week, 1,199 in all22%
  5. Noble CountyBest mid November · 33 checklists that week, 1,320 in all19%
  6. Ellis CountyBest late March · 10 checklists that week, 357 in all18%

Best spots

Share of checklists at the peak
  1. Greater Flint HillsOsage County, best late January · 23 checklists that week, 221 in all21%
  2. Sanborn Lake ParkPayne County, best early January · 26 checklists that week, 992 in all7.8%
  3. Lake Carl EtlingCimarron County, best mid April · 28 checklists that week, 413 in all6.9%
  4. CLO Lands (east)Payne County, best mid November · 20 checklists that week, 325 in all6.9%

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

Best time of day

In Oklahoma, the Brewer's Blackbird is most often listed on checklists started between 3 and 5 pm (1.1% of those checklists).

0%0.5%1%1.5%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: 0.6% of 8353 checklists7 am: 1.0% of 24509 checklists8 am: 1.1% of 27848 checklists9 am: 1.0% of 25316 checklists10 am: 1.0% of 21161 checklists11 am: 0.9% of 18730 checklists12 pm: 1.1% of 16097 checklists1 pm: 1.1% of 14028 checklists2 pm: 1.0% of 13599 checklists3 pm: 1.1% of 14228 checklists4 pm: 1.1% of 14597 checklists5 pm: 0.8% of 12125 checklists6 pm: 0.5% 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
January2.2%1.7%1.9%1.4%
February1.4%1.4%1.7%1.3%
March1.8%1.4%1.3%2.0%
April2.3%2.1%1.7%0.9%
May0.1%0%0%0%
June0%0%0%0%
July0%0%0%0%
August0%0%0%0%
September0%0.1%0.2%0.2%
October0.3%0.3%0.4%0.5%
November1.4%1.8%1.5%2.1%
December1.5%1.8%2.1%1.7%

Neighboring states

  • Kansas: arrives the second week of October, 3 weeks earlier than Oklahoma
  • Arkansas: arrives early November, in the same week than Oklahoma
  • Nebraska: arrives the second week of March, 17 weeks later than Oklahoma
  • Texas: arrives mid October, 2 weeks earlier than Oklahoma

Common questions

When do Brewer's Blackbirds arrive in Oklahoma?
Brewer's Blackbirds arrive in Oklahoma in early November, peak in early April (2.1% of checklists), and most are gone by late April.
When do Brewer's Blackbirds leave Oklahoma?
Most Brewer's Blackbirds have left Oklahoma by late April, when reports fall below half their usual rate.
When is the best time to see a Brewer's Blackbird in Oklahoma?
The Brewer's Blackbird is reported most often in early April, on about 2.1% of Oklahoma checklists.
Where in Oklahoma are Brewer's Blackbirds seen most often?
By county, Atoka County, Harmon County, and Hughes County have the highest peak reporting rates for the Brewer's Blackbird (counties with at least 200 checklists).