Last spring frost
Mar 31
Frost Dates for Girdletree, MD
First fall frost
Nov 15
Growing season
228 days
Hardiness zone
7b
In an average year around Girdletree, MD, the last spring frost (32°F) is about Mar 31 and the first fall frost is about Nov 15, giving roughly a 228-day growing season. To be safe most years, wait until Mar 15 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 1 | Apr 13 | Mar 29 |
| Freeze (32°F) | Apr 13 | Mar 31 | Mar 15 |
| Hard (28°F) | Apr 1 | Mar 17 | Feb 28 |
| Severe (24°F) | Mar 22 | Mar 5 | Feb 11 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 1 | Apr 24 | Apr 19 | Apr 16 | Apr 13 | Apr 11 | Apr 7 | Apr 3 | Mar 29 |
| 32°F | Apr 13 | Apr 8 | Apr 6 | Apr 2 | Mar 31 | Mar 28 | Mar 24 | Mar 21 | Mar 15 |
| 28°F | Apr 1 | Mar 28 | Mar 24 | Mar 20 | Mar 17 | Mar 14 | Mar 10 | Mar 5 | Feb 28 |
| 24°F | Mar 22 | Mar 17 | Mar 13 | Mar 8 | Mar 5 | Mar 1 | Feb 24 | Feb 19 | Feb 11 |
| 20°F | Mar 8 | Mar 2 | Feb 25 | Feb 19 | Feb 14 | Feb 10 | Feb 5 | Jan 31 | Jan 22 |
| 16°F | Feb 24 | Feb 16 | Feb 10 | Feb 4 | Feb 1 | Jan 28 | Jan 23 | Jan 15 | Jan 7 |
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 22 | Nov 4 | Nov 18 |
| Freeze (32°F) | Nov 1 | Nov 15 | Dec 1 |
| Hard (28°F) | Nov 11 | Nov 28 | Dec 19 |
| Severe (24°F) | Nov 24 | Dec 15 | Jan 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 22 | Oct 28 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 10 | Nov 14 | Nov 18 |
| 32°F | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 22 | Nov 25 | Dec 1 |
| 28°F | Nov 11 | Nov 17 | Nov 21 | Nov 25 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 19 |
| 24°F | Nov 24 | Dec 1 | Dec 5 | Dec 9 | Dec 15 | Dec 21 | Dec 26 | Jan 1 | Jan 7 |
| 20°F | Dec 9 | Dec 17 | Dec 23 | Dec 28 | Jan 1 | Jan 4 | Jan 9 | Jan 14 | Jan 25 |
| 16°F | Dec 21 | Dec 28 | Jan 1 | Jan 5 | Jan 9 | Jan 13 | Jan 19 | Jan 25 | Feb 1 |
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: Assateague, Md, about 8.8 miles away@if(!empty($station['elevation_ft'])), at 10 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 Girdletree, MD?
On average, the last spring frost (32°F) around Girdletree, MD is about Mar 31. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 15.
When is the first frost in the fall?
The first fall frost around Girdletree, MD typically arrives about Nov 15. 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 Mar 31 on average, or Mar 15 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 228 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 21829 Planting calendar → Maryland frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026