Last spring frost
Mar 31
Frost Dates for Konawa, OK
First fall frost
Nov 3
Growing season
216 days
Hardiness zone
7b
In an average year around Konawa, OK, the last spring frost (32°F) is about Mar 31 and the first fall frost is about Nov 3, giving roughly a 216-day growing season. To be safe most years, wait until Mar 10 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 29 | Apr 12 | Mar 25 |
| Freeze (32°F) | Apr 18 | Mar 31 | Mar 10 |
| Hard (28°F) | Apr 3 | Mar 14 | Feb 26 |
| Severe (24°F) | Mar 20 | Mar 3 | Feb 11 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 29 | Apr 23 | Apr 19 | Apr 16 | Apr 12 | Apr 8 | Apr 5 | Apr 1 | Mar 25 |
| 32°F | Apr 18 | Apr 10 | Apr 6 | Apr 3 | Mar 31 | Mar 26 | Mar 21 | Mar 16 | Mar 10 |
| 28°F | Apr 3 | Mar 29 | Mar 23 | Mar 17 | Mar 14 | Mar 10 | Mar 6 | Mar 3 | Feb 26 |
| 24°F | Mar 20 | Mar 14 | Mar 10 | Mar 6 | Mar 3 | Feb 28 | Feb 25 | Feb 20 | Feb 11 |
| 20°F | Mar 10 | Mar 5 | Mar 1 | Feb 25 | Feb 20 | Feb 14 | Feb 8 | Feb 1 | Jan 26 |
| 16°F | Mar 3 | Feb 24 | Feb 17 | Feb 10 | Feb 4 | Jan 30 | Jan 24 | Jan 15 | Jan 2 |
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 8 |
| Freeze (32°F) | Oct 19 | Nov 3 | Nov 19 |
| Hard (28°F) | Oct 25 | Nov 12 | Dec 2 |
| Severe (24°F) | Nov 3 | Nov 25 | Dec 15 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 10 | Oct 16 | Oct 20 | Oct 22 | Oct 25 | Oct 28 | Nov 1 | Nov 3 | Nov 8 |
| 32°F | Oct 19 | Oct 24 | Oct 28 | Nov 1 | Nov 3 | Nov 5 | Nov 9 | Nov 13 | Nov 19 |
| 28°F | Oct 25 | Nov 1 | Nov 4 | Nov 8 | Nov 12 | Nov 16 | Nov 21 | Nov 26 | Dec 2 |
| 24°F | Nov 3 | Nov 9 | Nov 14 | Nov 20 | Nov 25 | Nov 29 | Dec 3 | Dec 7 | Dec 15 |
| 20°F | Nov 13 | Nov 22 | Nov 28 | Dec 2 | Dec 7 | Dec 12 | Dec 18 | Dec 25 | Jan 3 |
| 16°F | Nov 27 | Dec 4 | Dec 10 | Dec 16 | Dec 23 | Dec 29 | Jan 4 | Jan 13 | Jan 27 |
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: Ada 2Nne Mesonet, Ok, about 13 miles away@if(!empty($station['elevation_ft'])), at 967 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 Konawa, OK?
On average, the last spring frost (32°F) around Konawa, OK is about Mar 31. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 10.
When is the first frost in the fall?
The first fall frost around Konawa, OK typically arrives about Nov 3. 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 10 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 74849 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026