WhenToBird

Geothlypis philadelphia · Parulidae

When Do Mourning Warblers Arrive in Nebraska?

Adult Mourning Warbler
Photo: John Rosford, CC BY 4.0 via iNaturalist

Mourning Warblers mostly pass through Nebraska: they arrive in the second week of May, peak in mid May (1.5% of checklists), and most are gone by early June.

When to look

First arrivalsMay 8-14the second week of May
Common byMay 8-14the second week of May
PeakMay 15-21mid May
Most gone byJun 1-7early June

Best: mid May. First arrivals the second week of May; most are gone by early June. Peak: on about 1.5% of Nebraska checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Maypeak season
  6. Juncommon
  7. Julnot usually seen
  8. Augcommon
  9. Seppeak season
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%1%2%3%Jan 1-7: 0% of 4210 checklistsJan 8-14: 0% of 2891 checklistsJan 15-21: 0% of 2685 checklistsJan 22-31: 0% of 3834 checklistsFeb 1-7: 0% of 2803 checklistsFeb 8-14: 0% of 3134 checklistsFeb 15-21: 0% of 4508 checklistsFeb 22-28: 0% of 3238 checklistsMar 1-7: 0% of 3862 checklistsMar 8-14: 0% of 4894 checklistsMar 15-21: 0% of 5862 checklistsMar 22-31: 0% of 8598 checklistsApr 1-7: 0% of 5530 checklistsApr 8-14: 0% of 5528 checklistsApr 15-21: 0% of 6091 checklistsApr 22-30: 0% of 8661 checklistsMay 1-7: 0.1% of 9842 checklistsMay 8-14: 1.0% of 10044 checklistsMay 15-21: 2.4% of 8863 checklistsMay 22-31: 1.3% of 10207 checklistsJun 1-7: 0.1% of 4922 checklistsJun 8-14: 0% of 4054 checklistsJun 15-21: 0% of 3680 checklistsJun 22-30: 0% of 4349 checklistsJul 1-7: 0% of 3277 checklistsJul 8-14: 0% of 2803 checklistsJul 15-21: 0% of 2842 checklistsJul 22-31: 0% of 3920 checklistsAug 1-7: 0% of 2981 checklistsAug 8-14: 0% of 2819 checklistsAug 15-21: 0.1% of 3179 checklistsAug 22-31: 0.9% of 4599 checklistsSep 1-7: 1.7% of 3958 checklistsSep 8-14: 1.2% of 3460 checklistsSep 15-21: 0.6% of 3435 checklistsSep 22-30: 0.1% of 4975 checklistsOct 1-7: 0.1% of 3611 checklistsOct 8-14: 0% of 3605 checklistsOct 15-21: 0% of 3474 checklistsOct 22-31: 0% of 4352 checklistsNov 1-7: 0% of 3119 checklistsNov 8-14: 0% of 2887 checklistsNov 15-21: 0% of 2568 checklistsNov 22-30: 0% of 3506 checklistsDec 1-7: 0% of 2453 checklistsDec 8-14: 0% of 2756 checklistsDec 15-21: 0% of 3760 checklistsDec 22-31: 0% of 3746 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 Nebraska 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 Nebraska

Best counties

Share of checklists at the peak
  1. Wayne CountyBest late May · 87 checklists that week, 1,960 in all9.9%
  2. Jefferson CountyBest mid August · 14 checklists that week, 804 in all5.4%
  3. Sarpy CountyBest early September · 276 checklists that week, 14,942 in all4.6%
  4. Cuming CountyBest early June · 10 checklists that week, 659 in all4.5%
  5. Pierce CountyBest late May · 36 checklists that week, 516 in all4.5%
  6. Nemaha CountyBest mid May · 103 checklists that week, 883 in all4.1%

Best spots

Share of checklists at the peak
  1. Towl ParkDouglas County, best late May · 82 checklists that week, 1,437 in all18%
  2. Wilderness ParkLancaster County, best mid May · 67 checklists that week, 465 in all16%
  3. Walnut Grove ParkDouglas County, best late May · 67 checklists that week, 516 in all14%
  4. Wilderness Park (south 2)Lancaster County, best early September · 20 checklists that week, 293 in all13%
  5. Wilderness Park (Beal Slough)Lancaster County, best mid May · 33 checklists that week, 217 in all12%
  6. Fontenelle Forest Association Local Resource Management Area (Old Home Creek)Sarpy County, best late August · 76 checklists that week, 1,592 in all11%

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

Best time of day

In Nebraska, the Mourning Warbler is most often listed on checklists started between 6 and 8 am (0.6% of those checklists).

0%0.5%1%12 am: too few checklists (60) to judge1 am: too few checklists (70) to judge2 am: too few checklists (74) to judge3 am: too few checklists (97) to judge4 am: too few checklists (318) to judge5 am: too few checklists (1382) to judge6 am: 0.6% of 6945 checklists7 am: 0.6% of 19066 checklists8 am: 0.5% of 24661 checklists9 am: 0.3% of 23438 checklists10 am: 0.2% of 20424 checklists11 am: 0.2% of 16727 checklists12 pm: 0.2% of 14774 checklists1 pm: 0.2% of 14443 checklists2 pm: 0.1% of 14830 checklists3 pm: 0.2% of 14445 checklists4 pm: 0.1% of 13353 checklists5 pm: 0.2% of 10506 checklists6 pm: 0.1% of 9208 checklists7 pm: 0.1% of 6334 checklists8 pm: too few checklists (2406) to judge9 pm: too few checklists (531) to judge10 pm: too few checklists (201) to judge11 pm: too few checklists (82) 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%0%0%
April0%0%0%0%
May0.1%1.0%2.4%1.3%
June0.1%0%0%0%
July0%0%0%0%
August0%0%0.1%0.9%
September1.7%1.2%0.6%0.1%
October0.1%0%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Kansas: arrives the second week of May, in the same week than Nebraska
  • South Dakota: arrives the second week of May, in the same week than Nebraska
  • Iowa: arrives the second week of May, in the same week than Nebraska
  • Missouri: arrives the second week of May, in the same week than Nebraska

Common questions

When do Mourning Warblers arrive in Nebraska?
Mourning Warblers mostly pass through Nebraska: they arrive in the second week of May, peak in mid May (1.5% of checklists), and most are gone by early June.
When do Mourning Warblers leave Nebraska?
Most Mourning Warblers have left Nebraska by early June, when reports fall below half their usual rate.
When is the best time to see a Mourning Warbler in Nebraska?
The Mourning Warbler is reported most often in mid May, on about 1.5% of Nebraska checklists.
Where in Nebraska are Mourning Warblers seen most often?
By county, Wayne County, Jefferson County, and Sarpy County have the highest peak reporting rates for the Mourning Warbler (counties with at least 200 checklists).