Last spring frost
Mar 21
Frost Dates for Medicine Park, OK
First fall frost
Nov 12
Growing season
234 days
Hardiness zone
8a
In an average year around Medicine Park, OK, the last spring frost (32°F) is about Mar 21 and the first fall frost is about Nov 12, giving roughly a 234-day growing season. To be safe most years, wait until Feb 28 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) | Apr 20 | Apr 3 | Mar 14 |
| Freeze (32°F) | Apr 8 | Mar 21 | Feb 28 |
| Hard (28°F) | Mar 31 | Mar 6 | Feb 18 |
| Severe (24°F) | Mar 13 | Feb 25 | Feb 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 15 | Apr 11 | Apr 6 | Apr 3 | Apr 1 | Mar 27 | Mar 22 | Mar 14 |
| 32°F | Apr 8 | Apr 3 | Mar 30 | Mar 25 | Mar 21 | Mar 16 | Mar 12 | Mar 6 | Feb 28 |
| 28°F | Mar 31 | Mar 21 | Mar 15 | Mar 11 | Mar 6 | Mar 2 | Feb 28 | Feb 24 | Feb 18 |
| 24°F | Mar 13 | Mar 7 | Mar 3 | Feb 28 | Feb 25 | Feb 21 | Feb 17 | Feb 12 | Feb 2 |
| 20°F | Mar 3 | Feb 27 | Feb 22 | Feb 18 | Feb 13 | Feb 8 | Feb 1 | Jan 24 | Jan 14 |
| 16°F | Feb 23 | Feb 16 | Feb 10 | Feb 5 | Jan 30 | Jan 22 | Jan 15 | Jan 4 | Dec 22 |
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 21 | Nov 4 | Nov 19 |
| Freeze (32°F) | Oct 27 | Nov 12 | Nov 28 |
| Hard (28°F) | Nov 1 | Nov 22 | Dec 7 |
| Severe (24°F) | Nov 10 | Dec 1 | Dec 22 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 21 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 14 | Nov 19 |
| 32°F | Oct 27 | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 23 | Nov 28 |
| 28°F | Nov 1 | Nov 9 | Nov 14 | Nov 18 | Nov 22 | Nov 25 | Nov 29 | Dec 2 | Dec 7 |
| 24°F | Nov 10 | Nov 17 | Nov 24 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 15 | Dec 22 |
| 20°F | Nov 22 | Nov 29 | Dec 4 | Dec 9 | Dec 15 | Dec 21 | Dec 27 | Jan 3 | Jan 14 |
| 16°F | Dec 1 | Dec 8 | Dec 16 | Dec 22 | Dec 28 | Jan 3 | Jan 11 | Jan 19 | Feb 4 |
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: Medicine Pk 3W Mesonet, Ok, about 3.9 miles away@if(!empty($station['elevation_ft'])), at 1,597 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 Medicine Park, OK?
On average, the last spring frost (32°F) around Medicine Park, OK is about Mar 21. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 28.
When is the first frost in the fall?
The first fall frost around Medicine Park, OK typically arrives about Nov 12. 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 21 on average, or Feb 28 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 234 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 73557 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026