Last spring frost
Apr 10
Frost Dates for Severna Park, MD
First fall frost
Oct 31
Growing season
204 days
Hardiness zone
7b
In an average year around Severna Park, MD, the last spring frost (32°F) is about Apr 10 and the first fall frost is about Oct 31, giving roughly a 204-day growing season. To be safe most years, wait until Mar 27 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 12 | Apr 24 | Apr 9 |
| Freeze (32°F) | Apr 25 | Apr 10 | Mar 27 |
| Hard (28°F) | Apr 10 | Mar 28 | Mar 13 |
| Severe (24°F) | Mar 31 | Mar 16 | Feb 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 12 | May 6 | May 1 | Apr 28 | Apr 24 | Apr 21 | Apr 18 | Apr 15 | Apr 9 |
| 32°F | Apr 25 | Apr 19 | Apr 16 | Apr 13 | Apr 10 | Apr 7 | Apr 3 | Mar 31 | Mar 27 |
| 28°F | Apr 10 | Apr 5 | Apr 2 | Mar 31 | Mar 28 | Mar 24 | Mar 21 | Mar 18 | Mar 13 |
| 24°F | Mar 31 | Mar 26 | Mar 22 | Mar 19 | Mar 16 | Mar 12 | Mar 9 | Mar 4 | Feb 28 |
| 20°F | Mar 20 | Mar 15 | Mar 11 | Mar 7 | Mar 4 | Mar 1 | Feb 25 | Feb 21 | Feb 13 |
| 16°F | Mar 10 | Mar 4 | Feb 28 | Feb 25 | Feb 20 | Feb 15 | Feb 9 | Feb 3 | 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 8 | Oct 21 | Nov 2 |
| Freeze (32°F) | Oct 17 | Oct 31 | Nov 12 |
| Hard (28°F) | Oct 30 | Nov 10 | Nov 27 |
| Severe (24°F) | Nov 8 | Nov 25 | Dec 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 8 | Oct 12 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 29 | Nov 2 |
| 32°F | Oct 17 | Oct 22 | Oct 26 | Oct 29 | Oct 31 | Nov 2 | Nov 5 | Nov 7 | Nov 12 |
| 28°F | Oct 30 | Nov 2 | Nov 5 | Nov 8 | Nov 10 | Nov 13 | Nov 17 | Nov 21 | Nov 27 |
| 24°F | Nov 8 | Nov 13 | Nov 17 | Nov 21 | Nov 25 | Nov 30 | Dec 2 | Dec 6 | Dec 13 |
| 20°F | Nov 20 | Nov 29 | Dec 2 | Dec 6 | Dec 10 | Dec 14 | Dec 19 | Dec 26 | Jan 1 |
| 16°F | Dec 5 | Dec 11 | Dec 17 | Dec 23 | Dec 27 | Jan 1 | Jan 4 | Jan 11 | Jan 21 |
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: Baltimore Wash Intl Ap, Md, about 6.2 miles away@if(!empty($station['elevation_ft'])), at 156 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 Severna Park, MD?
On average, the last spring frost (32°F) around Severna Park, MD is about Apr 10. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 27.
When is the first frost in the fall?
The first fall frost around Severna Park, MD typically arrives about Oct 31. 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 10 on average, or Mar 27 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 204 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 21108 Planting calendar → Maryland frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026