WhenToBird

Helmitheros vermivorum · Parulidae

When Do Worm-eating Warblers Arrive in Texas?

Adult Worm-eating Warbler
Photo: kirk gardner, CC BY 4.0 via iNaturalist

Worm-eating Warblers mostly pass through Texas: the first show up in late March, they are common by early April, peak in the second week of April (3.6% of checklists), and most are gone by late April.

When to look

First arrivalsMar 22-31late March
Common byApr 1-7early April
PeakApr 8-14the second week of April
Most gone byApr 22-30late April

Best: the second week of April. First arrivals late March; most are gone by late April. Peak: on about 3.6% of Texas checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Maruncommon
  4. Aprpeak season
  5. Mayuncommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augrare
  9. Seprare
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%2%4%6%Jan 1-7: 0% of 66038 checklistsJan 8-14: 0% of 52445 checklistsJan 15-21: 0% of 52985 checklistsJan 22-31: 0% of 71020 checklistsFeb 1-7: 0% of 52306 checklistsFeb 8-14: 0% of 55887 checklistsFeb 15-21: 0% of 69016 checklistsFeb 22-28: 0% of 52998 checklistsMar 1-7: 0% of 50836 checklistsMar 8-14: 0.1% of 51749 checklistsMar 15-21: 0.1% of 53731 checklistsMar 22-31: 0.9% of 82049 checklistsApr 1-7: 2.3% of 65854 checklistsApr 8-14: 3.6% of 78434 checklistsApr 15-21: 4.6% of 92302 checklistsApr 22-30: 2.4% of 122878 checklistsMay 1-7: 0.3% of 74592 checklistsMay 8-14: 0.1% of 61008 checklistsMay 15-21: 0.1% of 43365 checklistsMay 22-31: 0.1% of 52736 checklistsJun 1-7: 0.1% of 31643 checklistsJun 8-14: 0.1% of 30131 checklistsJun 15-21: 0.1% of 26802 checklistsJun 22-30: 0.1% of 32822 checklistsJul 1-7: 0.1% of 27213 checklistsJul 8-14: 0% of 24555 checklistsJul 15-21: 0.1% of 24146 checklistsJul 22-31: 0.1% of 34536 checklistsAug 1-7: 0% of 25764 checklistsAug 8-14: 0.1% of 26347 checklistsAug 15-21: 0.1% of 28431 checklistsAug 22-31: 0.1% of 42838 checklistsSep 1-7: 0.3% of 35070 checklistsSep 8-14: 0.4% of 33893 checklistsSep 15-21: 0.3% of 32572 checklistsSep 22-30: 0.2% of 43771 checklistsOct 1-7: 0.1% of 34143 checklistsOct 8-14: 0.1% of 37563 checklistsOct 15-21: 0.1% of 36263 checklistsOct 22-31: 0.1% of 49170 checklistsNov 1-7: 0.1% of 43301 checklistsNov 8-14: 0% of 48744 checklistsNov 15-21: 0.1% of 42213 checklistsNov 22-30: 0% of 54455 checklistsDec 1-7: 0% of 40166 checklistsDec 8-14: 0% of 41035 checklistsDec 15-21: 0% of 46983 checklistsDec 22-31: 0% of 73015 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 Texas 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 Texas

Best counties

Share of checklists at the peak
  1. Jefferson CountyBest the second week of April · 1548 checklists that week, 23,503 in all24%
  2. Galveston CountyBest the second week of April · 9460 checklists that week, 129,637 in all14%
  3. Brazoria CountyBest the second week of April · 1681 checklists that week, 38,709 in all9.3%
  4. San Jacinto CountyBest mid April · 74 checklists that week, 1,650 in all8.1%
  5. Nueces CountyBest the second week of April · 3892 checklists that week, 86,594 in all7.5%
  6. San Augustine CountyBest early April · 18 checklists that week, 745 in all6.5%

Best spots

Share of checklists at the peak
  1. Sabine WoodsJefferson County, best the second week of April · 601 checklists that week, 6,088 in all51%
  2. Pirates CoveGalveston County, best the second week of April · 1203 checklists that week, 11,139 in all32%
  3. Blucher ParkNueces County, best the second week of April · 436 checklists that week, 3,725 in all28%

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

Best time of day

In Texas, the Worm-eating Warbler is most often listed on checklists started between 2 and 4 pm (0.9% of those checklists).

0%0.5%1%12 am: too few checklists (898) to judge1 am: too few checklists (756) to judge2 am: too few checklists (663) to judge3 am: too few checklists (741) to judge4 am: too few checklists (1537) to judge5 am: too few checklists (6113) to judge6 am: 0.3% of 74687 checklists7 am: 0.5% of 285131 checklists8 am: 0.5% of 329960 checklists9 am: 0.5% of 267889 checklists10 am: 0.5% of 218205 checklists11 am: 0.6% of 178879 checklists12 pm: 0.6% of 153722 checklists1 pm: 0.7% of 144662 checklists2 pm: 0.9% of 138578 checklists3 pm: 0.9% of 136878 checklists4 pm: 0.8% of 137550 checklists5 pm: 0.6% of 113599 checklists6 pm: 0.4% of 81743 checklists7 pm: 0.1% of 53396 checklists8 pm: too few checklists (17221) to judge9 pm: too few checklists (4048) to judge10 pm: too few checklists (1965) to judge11 pm: too few checklists (990) 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%0.1%0.9%
April2.3%3.6%4.6%2.4%
May0.3%0.1%0.1%0.1%
June0.1%0.1%0.1%0.1%
July0.1%0%0.1%0.1%
August0%0.1%0.1%0.1%
September0.3%0.4%0.3%0.2%
October0.1%0.1%0.1%0.1%
November0.1%0%0.1%0%
December0%0%0%0%

Neighboring states

  • Louisiana: arrives late March, in the same week than Texas
  • Arkansas: arrives the second week of April, 2 weeks later than Texas
  • Mississippi: arrives mid March, 1 week earlier than Texas
  • Alabama: arrives late March, in the same week than Texas

Common questions

When do Worm-eating Warblers arrive in Texas?
Worm-eating Warblers mostly pass through Texas: the first show up in late March, they are common by early April, peak in the second week of April (3.6% of checklists), and most are gone by late April.
When do Worm-eating Warblers leave Texas?
Most Worm-eating Warblers have left Texas by late April, when reports fall below half their usual rate. Stragglers are still reported until early May.
When is the best time to see a Worm-eating Warbler in Texas?
The Worm-eating Warbler is reported most often in the second week of April, on about 3.6% of Texas checklists.
Where in Texas are Worm-eating Warblers seen most often?
By county, Jefferson County, Galveston County, and Brazoria County have the highest peak reporting rates for the Worm-eating Warbler (counties with at least 200 checklists).