Last spring frost
Apr 6
Frost Dates for El Reno, OK
First fall frost
Oct 31
Growing season
206 days
Hardiness zone
7b
In an average year around El Reno, OK, the last spring frost (32°F) is about Apr 6 and the first fall frost is about Oct 31, giving roughly a 206-day growing season. To be safe most years, wait until Mar 21 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) | May 1 | Apr 17 | Apr 1 |
| Freeze (32°F) | Apr 22 | Apr 6 | Mar 21 |
| Hard (28°F) | Apr 11 | Mar 26 | Mar 9 |
| Severe (24°F) | Apr 1 | Mar 14 | Feb 27 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 1 | Apr 26 | Apr 24 | Apr 21 | Apr 17 | Apr 14 | Apr 10 | Apr 7 | Apr 1 |
| 32°F | Apr 22 | Apr 16 | Apr 12 | Apr 9 | Apr 6 | Apr 3 | Mar 31 | Mar 27 | Mar 21 |
| 28°F | Apr 11 | Apr 6 | Apr 2 | Mar 30 | Mar 26 | Mar 22 | Mar 18 | Mar 14 | Mar 9 |
| 24°F | Apr 1 | Mar 27 | Mar 23 | Mar 18 | Mar 14 | Mar 11 | Mar 8 | Mar 4 | Feb 27 |
| 20°F | Mar 20 | Mar 14 | Mar 11 | Mar 7 | Mar 4 | Mar 1 | Feb 26 | Feb 22 | Feb 14 |
| 16°F | Mar 13 | Mar 8 | Mar 3 | Feb 28 | Feb 23 | Feb 18 | Feb 12 | Feb 4 | Jan 24 |
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 3 | Oct 21 | Nov 4 |
| Freeze (32°F) | Oct 15 | Oct 31 | Nov 13 |
| Hard (28°F) | Oct 24 | Nov 7 | Nov 24 |
| Severe (24°F) | Oct 31 | Nov 16 | Dec 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 3 | Oct 10 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 31 | Nov 4 |
| 32°F | Oct 15 | Oct 21 | Oct 24 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 13 |
| 28°F | Oct 24 | Oct 30 | Nov 2 | Nov 5 | Nov 7 | Nov 11 | Nov 14 | Nov 18 | Nov 24 |
| 24°F | Oct 31 | Nov 6 | Nov 9 | Nov 13 | Nov 16 | Nov 20 | Nov 24 | Nov 29 | Dec 3 |
| 20°F | Nov 8 | Nov 15 | Nov 20 | Nov 24 | Nov 28 | Dec 1 | Dec 5 | Dec 12 | Dec 20 |
| 16°F | Nov 19 | Nov 27 | Dec 1 | Dec 6 | Dec 12 | Dec 18 | Dec 24 | Dec 31 | Jan 8 |
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: El Reno 1 N, Ok, about 3 miles away@if(!empty($station['elevation_ft'])), at 1,325 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 El Reno, OK?
On average, the last spring frost (32°F) around El Reno, OK is about Apr 6. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 21.
When is the first frost in the fall?
The first fall frost around El Reno, OK typically arrives about Oct 31. 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 6 on average, or Mar 21 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 206 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 73036 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026