Last spring frost
Mar 30
Frost Dates for Tulsa, OK
First fall frost
Nov 4
Growing season
220 days
Hardiness zone
7b
In an average year around Tulsa, OK, the last spring frost (32°F) is about Mar 30 and the first fall frost is about Nov 4, giving roughly a 220-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 26 | Apr 9 | Mar 26 |
| Freeze (32°F) | Apr 17 | Mar 30 | Mar 10 |
| Hard (28°F) | Apr 3 | Mar 15 | Feb 27 |
| Severe (24°F) | Mar 20 | Mar 4 | Feb 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 26 | Apr 21 | Apr 17 | Apr 13 | Apr 9 | Apr 7 | Apr 4 | Mar 31 | Mar 26 |
| 32°F | Apr 17 | Apr 9 | Apr 5 | Apr 2 | Mar 30 | Mar 27 | Mar 23 | Mar 18 | Mar 10 |
| 28°F | Apr 3 | Mar 28 | Mar 23 | Mar 19 | Mar 15 | Mar 12 | Mar 9 | Mar 4 | Feb 27 |
| 24°F | Mar 20 | Mar 14 | Mar 10 | Mar 7 | Mar 4 | Feb 28 | Feb 25 | Feb 21 | Feb 12 |
| 20°F | Mar 12 | Mar 6 | Mar 1 | Feb 26 | Feb 22 | Feb 16 | Feb 11 | Feb 4 | Jan 27 |
| 16°F | Mar 4 | Feb 26 | Feb 19 | Feb 12 | Feb 6 | Feb 1 | Jan 28 | Jan 20 | Jan 8 |
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 12 | Oct 26 | Nov 8 |
| Freeze (32°F) | Oct 21 | Nov 4 | Nov 20 |
| Hard (28°F) | Oct 31 | Nov 14 | Dec 2 |
| Severe (24°F) | Nov 7 | Nov 26 | Dec 14 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 18 | Oct 21 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 8 |
| 32°F | Oct 21 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 6 | Nov 11 | Nov 15 | Nov 20 |
| 28°F | Oct 31 | Nov 3 | Nov 7 | Nov 11 | Nov 14 | Nov 18 | Nov 22 | Nov 27 | Dec 2 |
| 24°F | Nov 7 | Nov 13 | Nov 18 | Nov 22 | Nov 26 | Nov 30 | Dec 4 | Dec 7 | Dec 14 |
| 20°F | Nov 18 | Nov 25 | Nov 30 | Dec 4 | Dec 8 | Dec 12 | Dec 17 | Dec 23 | Dec 31 |
| 16°F | Dec 1 | Dec 8 | Dec 13 | Dec 19 | Dec 24 | Dec 29 | Jan 2 | Jan 9 | Jan 19 |
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: Tulsa R L Jones Jr Ap, Ok, about 1.9 miles away@if(!empty($station['elevation_ft'])), at 638 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 Tulsa, OK?
On average, the last spring frost (32°F) around Tulsa, OK is about Mar 30. 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 Tulsa, 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 Mar 30 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 220 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 74132 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026