Best Time to See Yellow Rumped Warblers in Delaware
October, February and March is the best time to see yellow rumped warblers in Delaware. Based on 672 verified iNaturalist observations, here is exactly when yellow rumped warblers are most active across the year in Delaware.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 20, 2026.
Yellow-rumped Warbler · inbetweenbays CC BY
Yellow-rumped Warbler · inbetweenbays CC BY
Yellow-rumped Warbler · inbetweenbays CC BY
672 verified observations of yellow rumped warblers in Delaware, recorded across 11 months of the year on iNaturalist.
When yellow rumped warblers are recorded in Delaware
Peak month
October
166 records (24.7% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 78 | 11.6% |
| Februarypeak | 109 | 16.2% |
| Marchpeak | 83 | 12.4% |
| April | 76 | 11.3% |
| May | 34 | 5.1% |
| June | 1 | 0.1% |
| July | 0 | 0% |
| August | 1 | 0.1% |
| September | 4 | 0.6% |
| Octoberpeak | 166 | 24.7% |
| November | 71 | 10.6% |
| December | 49 | 7.3% |
Yellow Rumped Warblers you are most likely to see
| Species | Verified observations |
|---|---|
| Yellow-rumped Warbler | 672 |
Weather to expect, source Open-Meteo
Typical weather in Delaware
Recent typical conditions by month, so you can plan a trip around both when yellow rumped warblers are active and what the weather is doing. The best months to look for yellow rumped warblers sit around 33 to 68 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 44°F | 32°F | 2.9" |
| Febbest time | 47°F | 33°F | 3.8" |
| Marbest time | 54°F | 39°F | 3.8" |
| Apr | 63°F | 48°F | 4.5" |
| May | 70°F | 56°F | 3.9" |
| Jun | 79°F | 66°F | 3.9" |
| Jul | 86°F | 73°F | 6" |
| Aug | 83°F | 72°F | 5.1" |
| Sep | 77°F | 65°F | 4.3" |
| Octbest time | 68°F | 55°F | 4.4" |
| Nov | 56°F | 43°F | 2.8" |
| Dec | 48°F | 36°F | 4.8" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Delaware. Weather varies year to year, so treat these as a guide.
Sightings of yellow rumped warblers in Delaware peak in October, when 166 of the year's 672 verified observations are logged — about 24.7% of the annual total. Activity stays high through October, February and March.
The quietest stretch is July, June and August, when yellow rumped warblers are hardest to find — no verified records exist for July. If a reliable sighting matters, plan around the peak window rather than the off-season.
The yellow rumped warblers you are most likely to encounter in Delaware are Yellow-rumped Warbler — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see yellow rumped warblers in Delaware
- Captain John Smith Chesapeake National Historic Trail — National Historic Trail
- Chesapeake Bay
- First State National Historical Park — National Historical Park
- Washington-Rochambeau Revolutionary Route National Historic Trail — National Historic Trail
- Cape Henlopen State Park
- Bombay Hook National Wildlife Refuge
Frequently asked questions
What is the best month to see yellow rumped warblers in Delaware?+
October is the single best month, and the broader peak window runs through October, February and March, based on 672 verified iNaturalist observations.
When are yellow rumped warblers hardest to see in Delaware?+
July is the quietest month for yellow rumped warblers in Delaware, with no verified records on iNaturalist.
Are yellow rumped warblers active year-round in Delaware?+
Yellow rumped warblers are recorded in 11 of 12 months in Delaware, so they can be seen year-round, with a clear peak in October.
More wildlife in Delaware