Last spring frost
Apr 2
Frost Dates for Oklahoma City, OK
First fall frost
Nov 4
Growing season
216 days
Hardiness zone
7b
In an average year around Oklahoma City, OK, the last spring frost (32°F) is about Apr 2 and the first fall frost is about Nov 4, giving roughly a 216-day growing season. To be safe most years, wait until Mar 14 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 13 | Mar 30 |
| Freeze (32°F) | Apr 18 | Apr 2 | Mar 14 |
| Hard (28°F) | Apr 5 | Mar 19 | Feb 28 |
| Severe (24°F) | Mar 27 | Mar 8 | Feb 19 |
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 13 | Apr 9 | Apr 7 | Apr 3 | Mar 30 |
| 32°F | Apr 18 | Apr 11 | Apr 8 | Apr 5 | Apr 2 | Mar 30 | Mar 27 | Mar 21 | Mar 14 |
| 28°F | Apr 5 | Mar 31 | Mar 28 | Mar 23 | Mar 19 | Mar 14 | Mar 11 | Mar 6 | Feb 28 |
| 24°F | Mar 27 | Mar 20 | Mar 15 | Mar 11 | Mar 8 | Mar 4 | Feb 28 | Feb 24 | Feb 19 |
| 20°F | Mar 15 | Mar 9 | Mar 5 | Mar 2 | Feb 27 | Feb 23 | Feb 19 | Feb 13 | Jan 31 |
| 16°F | Mar 7 | Mar 2 | Feb 25 | Feb 20 | Feb 14 | Feb 8 | Feb 1 | Jan 27 | Jan 16 |
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 14 | Oct 27 | Nov 9 |
| Freeze (32°F) | Oct 21 | Nov 4 | Nov 18 |
| Hard (28°F) | Oct 31 | Nov 13 | Nov 30 |
| Severe (24°F) | Nov 5 | Nov 24 | Dec 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 14 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 9 |
| 32°F | Oct 21 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 10 | Nov 13 | Nov 18 |
| 28°F | Oct 31 | Nov 3 | Nov 7 | Nov 10 | Nov 13 | Nov 16 | Nov 19 | Nov 23 | Nov 30 |
| 24°F | Nov 5 | Nov 11 | Nov 15 | Nov 20 | Nov 24 | Nov 27 | Dec 1 | Dec 4 | Dec 10 |
| 20°F | Nov 14 | Nov 22 | Nov 26 | Nov 30 | Dec 3 | Dec 8 | Dec 13 | Dec 19 | Dec 27 |
| 16°F | Nov 25 | Dec 2 | Dec 7 | Dec 13 | Dec 20 | Dec 25 | Jan 1 | Jan 7 | Jan 17 |
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: Oklahoma City Post Ap, Ok, about 5.3 miles away@if(!empty($station['elevation_ft'])), at 1,297 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 Oklahoma City, OK?
On average, the last spring frost (32°F) around Oklahoma City, OK is about Apr 2. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 14.
When is the first frost in the fall?
The first fall frost around Oklahoma City, OK typically arrives about Nov 4. 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 2 on average, or Mar 14 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 73120 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026