Last spring frost
Mar 31
Frost Dates for Twin Oaks, OK
First fall frost
Nov 2
Growing season
216 days
Hardiness zone
7a
In an average year around Twin Oaks, OK, the last spring frost (32°F) is about Mar 31 and the first fall frost is about Nov 2, giving roughly a 216-day growing season. To be safe most years, wait until Mar 13 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 30 | Apr 13 | Mar 27 |
| Freeze (32°F) | Apr 18 | Mar 31 | Mar 13 |
| Hard (28°F) | Apr 4 | Mar 19 | Feb 28 |
| Severe (24°F) | Mar 26 | Mar 7 | Feb 17 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 30 | Apr 25 | Apr 21 | Apr 17 | Apr 13 | Apr 9 | Apr 6 | Apr 2 | Mar 27 |
| 32°F | Apr 18 | Apr 12 | Apr 6 | Apr 3 | Mar 31 | Mar 28 | Mar 24 | Mar 19 | Mar 13 |
| 28°F | Apr 4 | Mar 31 | Mar 27 | Mar 24 | Mar 19 | Mar 15 | Mar 11 | Mar 6 | Feb 28 |
| 24°F | Mar 26 | Mar 19 | Mar 14 | Mar 10 | Mar 7 | Mar 4 | Mar 1 | Feb 25 | Feb 17 |
| 20°F | Mar 15 | Mar 9 | Mar 5 | Mar 2 | Feb 28 | Feb 24 | Feb 18 | Feb 13 | Feb 3 |
| 16°F | Mar 9 | Mar 3 | Feb 28 | Feb 22 | Feb 17 | Feb 11 | Feb 6 | Jan 30 | Jan 20 |
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 10 | Oct 25 | Nov 6 |
| Freeze (32°F) | Oct 20 | Nov 2 | Nov 19 |
| Hard (28°F) | Oct 28 | Nov 12 | Dec 1 |
| Severe (24°F) | Nov 4 | Nov 24 | Dec 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 10 | Oct 15 | Oct 19 | Oct 22 | Oct 25 | Oct 27 | Oct 30 | Nov 2 | Nov 6 |
| 32°F | Oct 20 | Oct 25 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 19 |
| 28°F | Oct 28 | Nov 1 | Nov 4 | Nov 8 | Nov 12 | Nov 15 | Nov 20 | Nov 25 | Dec 1 |
| 24°F | Nov 4 | Nov 10 | Nov 15 | Nov 19 | Nov 24 | Nov 28 | Dec 2 | Dec 6 | Dec 12 |
| 20°F | Nov 14 | Nov 22 | Nov 28 | Dec 2 | Dec 5 | Dec 9 | Dec 15 | Dec 22 | Dec 30 |
| 16°F | Nov 26 | Dec 2 | Dec 8 | Dec 14 | Dec 21 | Dec 26 | Dec 31 | Jan 6 | Jan 14 |
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: Kansas 2 Ne, Ok, about 3.9 miles away@if(!empty($station['elevation_ft'])), at 1,190 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 Twin Oaks, OK?
On average, the last spring frost (32°F) around Twin Oaks, OK is about Mar 31. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 13.
When is the first frost in the fall?
The first fall frost around Twin Oaks, OK typically arrives about Nov 2. 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 13 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 216 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 74368 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026