Last spring frost
Apr 7
Frost Dates for Millville, DE
First fall frost
Nov 2
Growing season
209 days
Hardiness zone
7b
In an average year around Millville, DE, the last spring frost (32°F) is about Apr 7 and the first fall frost is about Nov 2, giving roughly a 209-day growing season. To be safe most years, wait until Mar 24 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 8 | Apr 21 | Apr 5 |
| Freeze (32°F) | Apr 23 | Apr 7 | Mar 24 |
| Hard (28°F) | Apr 7 | Mar 26 | Mar 9 |
| Severe (24°F) | Mar 29 | Mar 13 | Feb 22 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 8 | May 2 | Apr 28 | Apr 24 | Apr 21 | Apr 18 | Apr 15 | Apr 11 | Apr 5 |
| 32°F | Apr 23 | Apr 17 | Apr 13 | Apr 9 | Apr 7 | Apr 4 | Apr 1 | Mar 30 | Mar 24 |
| 28°F | Apr 7 | Apr 3 | Mar 31 | Mar 29 | Mar 26 | Mar 23 | Mar 19 | Mar 15 | Mar 9 |
| 24°F | Mar 29 | Mar 23 | Mar 20 | Mar 16 | Mar 13 | Mar 9 | Mar 5 | Feb 28 | Feb 22 |
| 20°F | Mar 18 | Mar 13 | Mar 8 | Mar 4 | Feb 28 | Feb 25 | Feb 19 | Feb 13 | Feb 5 |
| 16°F | Mar 8 | Mar 1 | Feb 24 | Feb 18 | Feb 10 | Feb 5 | Feb 1 | Jan 26 | Jan 15 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 11 | Oct 24 | Nov 5 |
| Freeze (32°F) | Oct 20 | Nov 2 | Nov 16 |
| Hard (28°F) | Nov 1 | Nov 14 | Dec 1 |
| Severe (24°F) | Nov 9 | Nov 28 | Dec 20 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 11 | Oct 15 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 5 |
| 32°F | Oct 20 | Oct 25 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 7 | Nov 11 | Nov 16 |
| 28°F | Nov 1 | Nov 5 | Nov 8 | Nov 12 | Nov 14 | Nov 17 | Nov 21 | Nov 26 | Dec 1 |
| 24°F | Nov 9 | Nov 15 | Nov 20 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 9 | Dec 20 |
| 20°F | Nov 22 | Nov 30 | Dec 4 | Dec 10 | Dec 15 | Dec 21 | Dec 26 | Jan 1 | Jan 8 |
| 16°F | Dec 9 | Dec 18 | Dec 25 | Dec 30 | Jan 2 | Jan 8 | Jan 12 | Jan 19 | Jan 30 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Ocean City Muni Ap, Md, about 16 miles away@if(!empty($station['elevation_ft'])), at 12 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Millville, DE?
On average, the last spring frost (32°F) around Millville, DE is about Apr 7. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 24.
When is the first frost in the fall?
The first fall frost around Millville, DE typically arrives about Nov 2. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 7 on average, or Mar 24 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 209 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 19967 Planting calendar → Delaware frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026