Last spring frost
Mar 26
Frost Dates for Geronimo, OK
First fall frost
Nov 6
Growing season
225 days
Hardiness zone
8a
In an average year around Geronimo, OK, the last spring frost (32°F) is about Mar 26 and the first fall frost is about Nov 6, giving roughly a 225-day growing season. To be safe most years, wait until Mar 3 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 25 | Apr 8 | Mar 20 |
| Freeze (32°F) | Apr 15 | Mar 26 | Mar 3 |
| Hard (28°F) | Apr 1 | Mar 10 | Feb 22 |
| Severe (24°F) | Mar 17 | Feb 28 | Feb 6 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 25 | Apr 20 | Apr 16 | Apr 12 | Apr 8 | Apr 4 | Apr 1 | Mar 28 | Mar 20 |
| 32°F | Apr 15 | Apr 7 | Apr 3 | Mar 31 | Mar 26 | Mar 21 | Mar 15 | Mar 10 | Mar 3 |
| 28°F | Apr 1 | Mar 26 | Mar 19 | Mar 14 | Mar 10 | Mar 6 | Mar 3 | Feb 27 | Feb 22 |
| 24°F | Mar 17 | Mar 11 | Mar 6 | Mar 3 | Feb 28 | Feb 25 | Feb 21 | Feb 15 | Feb 6 |
| 20°F | Mar 8 | Mar 2 | Feb 26 | Feb 21 | Feb 15 | Feb 9 | Feb 3 | Jan 28 | Jan 19 |
| 16°F | Feb 28 | Feb 18 | Feb 9 | Feb 3 | Jan 29 | Jan 24 | Jan 17 | Jan 7 | Dec 27 |
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 16 | Oct 30 | Nov 11 |
| Freeze (32°F) | Oct 23 | Nov 6 | Nov 21 |
| Hard (28°F) | Oct 28 | Nov 15 | Dec 1 |
| 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 16 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 11 |
| 32°F | Oct 23 | Oct 28 | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 21 |
| 28°F | Oct 28 | Nov 4 | Nov 8 | Nov 12 | Nov 15 | Nov 19 | Nov 23 | Nov 27 | Dec 1 |
| 24°F | Nov 7 | Nov 14 | Nov 19 | Nov 23 | Nov 26 | Nov 30 | Dec 3 | Dec 7 | Dec 14 |
| 20°F | Nov 18 | Nov 26 | Nov 30 | Dec 3 | Dec 7 | Dec 13 | Dec 18 | Dec 25 | Jan 6 |
| 16°F | Nov 30 | Dec 5 | Dec 11 | Dec 17 | Dec 23 | Dec 30 | Jan 6 | Jan 16 | Jan 29 |
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: Walters 4Nw Mesonet, Ok, about 5.6 miles away@if(!empty($station['elevation_ft'])), at 1,063 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 Geronimo, OK?
On average, the last spring frost (32°F) around Geronimo, OK is about Mar 26. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 3.
When is the first frost in the fall?
The first fall frost around Geronimo, OK typically arrives about Nov 6. 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 26 on average, or Mar 3 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 225 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 73543 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026