Last spring frost
Apr 3
Frost Dates for Delta, MD
First fall frost
Nov 6
Growing season
217 days
Hardiness zone
7a
In an average year around Delta, MD, the last spring frost (32°F) is about Apr 3 and the first fall frost is about Nov 6, giving roughly a 217-day growing season. To be safe most years, wait until Mar 22 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 5 | Apr 18 | Apr 3 |
| Freeze (32°F) | Apr 18 | Apr 3 | Mar 22 |
| Hard (28°F) | Apr 6 | Mar 24 | Mar 8 |
| Severe (24°F) | Mar 28 | Mar 13 | Feb 27 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 29 | Apr 24 | Apr 21 | Apr 18 | Apr 15 | Apr 11 | Apr 7 | Apr 3 |
| 32°F | Apr 18 | Apr 14 | Apr 9 | Apr 6 | Apr 3 | Apr 1 | Mar 30 | Mar 27 | Mar 22 |
| 28°F | Apr 6 | Apr 2 | Mar 31 | Mar 28 | Mar 24 | Mar 21 | Mar 18 | Mar 14 | Mar 8 |
| 24°F | Mar 28 | Mar 24 | Mar 20 | Mar 17 | Mar 13 | Mar 10 | Mar 7 | Mar 3 | Feb 27 |
| 20°F | Mar 20 | Mar 15 | Mar 10 | Mar 7 | Mar 3 | Feb 28 | Feb 25 | Feb 19 | Feb 11 |
| 16°F | Mar 11 | Mar 5 | Mar 1 | Feb 25 | Feb 20 | Feb 15 | Feb 9 | Feb 4 | Jan 28 |
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 13 | Oct 28 | Nov 7 |
| Freeze (32°F) | Oct 26 | Nov 6 | Nov 19 |
| Hard (28°F) | Nov 4 | Nov 17 | Dec 1 |
| Severe (24°F) | Nov 12 | Nov 29 | Dec 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 13 | Oct 19 | Oct 23 | Oct 26 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 7 |
| 32°F | Oct 26 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 8 | Nov 12 | Nov 14 | Nov 19 |
| 28°F | Nov 4 | Nov 8 | Nov 11 | Nov 14 | Nov 17 | Nov 20 | Nov 23 | Nov 27 | Dec 1 |
| 24°F | Nov 12 | Nov 16 | Nov 20 | Nov 25 | Nov 29 | Dec 2 | Dec 7 | Dec 14 | Dec 23 |
| 20°F | Nov 26 | Dec 2 | Dec 7 | Dec 12 | Dec 19 | Dec 23 | Dec 27 | Jan 1 | Jan 8 |
| 16°F | Dec 9 | Dec 19 | Dec 25 | Dec 29 | Jan 2 | Jan 6 | Jan 10 | Jan 16 | Jan 23 |
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: Conowingo Dam, Md, about 7.6 miles away@if(!empty($station['elevation_ft'])), at 40 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 Delta, MD?
On average, the last spring frost (32°F) around Delta, MD is about Apr 3. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 22.
When is the first frost in the fall?
The first fall frost around Delta, MD typically arrives about Nov 6. 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 3 on average, or Mar 22 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 217 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 21160 Planting calendar → Maryland frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026