Last spring frost
Apr 11
Frost Dates for Denton, MD
First fall frost
Oct 30
Growing season
200 days
Hardiness zone
7b
In an average year around Denton, MD, the last spring frost (32°F) is about Apr 11 and the first fall frost is about Oct 30, giving roughly a 200-day growing season. To be safe most years, wait until Mar 29 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 13 | Apr 26 | Apr 11 |
| Freeze (32°F) | Apr 28 | Apr 11 | Mar 29 |
| Hard (28°F) | Apr 11 | Mar 30 | Mar 15 |
| Severe (24°F) | Mar 31 | Mar 17 | Mar 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 13 | May 6 | May 2 | Apr 29 | Apr 26 | Apr 23 | Apr 20 | Apr 16 | Apr 11 |
| 32°F | Apr 28 | Apr 22 | Apr 18 | Apr 14 | Apr 11 | Apr 8 | Apr 5 | Apr 2 | Mar 29 |
| 28°F | Apr 11 | Apr 6 | Apr 3 | Apr 1 | Mar 30 | Mar 28 | Mar 25 | Mar 21 | Mar 15 |
| 24°F | Mar 31 | Mar 28 | Mar 24 | Mar 20 | Mar 17 | Mar 14 | Mar 11 | Mar 7 | Mar 2 |
| 20°F | Mar 21 | Mar 16 | Mar 13 | Mar 9 | Mar 6 | Mar 3 | Feb 28 | Feb 23 | Feb 17 |
| 16°F | Mar 12 | Mar 6 | Mar 2 | Feb 28 | Feb 23 | Feb 19 | Feb 14 | Feb 9 | Feb 1 |
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 5 | Oct 19 | Nov 1 |
| Freeze (32°F) | Oct 14 | Oct 30 | Nov 13 |
| Hard (28°F) | Oct 26 | Nov 11 | Nov 29 |
| Severe (24°F) | Nov 6 | Nov 25 | Dec 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 5 | Oct 9 | Oct 13 | Oct 16 | Oct 19 | Oct 21 | Oct 24 | Oct 27 | Nov 1 |
| 32°F | Oct 14 | Oct 20 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 13 |
| 28°F | Oct 26 | Nov 1 | Nov 4 | Nov 7 | Nov 11 | Nov 14 | Nov 18 | Nov 23 | Nov 29 |
| 24°F | Nov 6 | Nov 13 | Nov 17 | Nov 21 | Nov 25 | Nov 29 | Dec 2 | Dec 7 | Dec 13 |
| 20°F | Nov 20 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 14 | Dec 19 | Dec 24 | Dec 31 |
| 16°F | Dec 3 | Dec 9 | Dec 17 | Dec 22 | Dec 26 | Dec 31 | Jan 4 | Jan 13 | 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: Greenwood 2Ne, De, about 13.7 miles away@if(!empty($station['elevation_ft'])), at 45 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 Denton, MD?
On average, the last spring frost (32°F) around Denton, MD is about Apr 11. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 29.
When is the first frost in the fall?
The first fall frost around Denton, MD typically arrives about Oct 30. 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 11 on average, or Mar 29 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 200 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 21629 Planting calendar → Maryland frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026