Best Time to See Seals in Delaware
March, February and January is the best time to see seals in Delaware. Based on 278 verified iNaturalist observations, here is exactly when seals 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 June 28, 2026.
Atlantic Grey Seal · inbetweenbays CC BY
Harbor Seal · 116916927065934112165 CC BY
Grey Seal · inbetweenbays CC BY
278 verified observations of seals in Delaware, recorded across 7 months of the year on iNaturalist.
When seals are recorded in Delaware
Peak month
March
124 records (44.6% of the year)
| Month | Observations | Share |
|---|---|---|
| Januarypeak | 53 | 19.1% |
| Februarypeak | 62 | 22.3% |
| Marchpeak | 124 | 44.6% |
| April | 13 | 4.7% |
| May | 1 | 0.4% |
| June | 0 | 0% |
| July | 0 | 0% |
| August | 0 | 0% |
| September | 0 | 0% |
| October | 0 | 0% |
| November | 1 | 0.4% |
| December | 24 | 8.6% |
Seals you are most likely to see
| Species | Verified observations |
|---|---|
| Grey Seal | 143 |
| Harbor Seal | 123 |
| Harp Seal | 2 |
Weather to expect, source Open-Meteo
Typical weather in Delaware
Recent typical conditions by month, so you can plan a trip around both when seals are active and what the weather is doing. The best months to look for seals sit around 32 to 54 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Janbest time | 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" |
| Oct | 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.
More on seals in Delaware:
Sightings of seals in Delaware peak in March, when 124 of the year's 278 verified observations are logged — about 44.6% of the annual total. Activity stays high through March, February and January.
The quietest stretch is June, July and August, when seals are hardest to find — no verified records exist for June. If a reliable sighting matters, plan around the peak window rather than the off-season.
The seals you are most likely to encounter in Delaware are Grey Seal, Harbor Seal and Harp Seal — 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 seals 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
Frequently asked questions
What is the best month to see seals in Delaware?+
March is the single best month, and the broader peak window runs through March, February and January, based on 278 verified iNaturalist observations.
When are seals hardest to see in Delaware?+
June is the quietest month for seals in Delaware, with no verified records on iNaturalist.
Are seals active year-round in Delaware?+
Seals are recorded in 7 of 12 months in Delaware, concentrated around March and February.
More places to see seals
More wildlife in Delaware