Last spring frost
Mar 21
Frost Dates for Lone Grove, OK
First fall frost
Nov 8
Growing season
231 days
Hardiness zone
8a
In an average year around Lone Grove, OK, the last spring frost (32°F) is about Mar 21 and the first fall frost is about Nov 8, giving roughly a 231-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 5 | Mar 18 |
| Freeze (32°F) | Apr 10 | Mar 21 | Mar 3 |
| Hard (28°F) | Mar 27 | Mar 7 | Feb 17 |
| Severe (24°F) | Mar 14 | Feb 26 | Jan 30 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 25 | Apr 19 | Apr 12 | Apr 8 | Apr 5 | Apr 2 | Mar 30 | Mar 24 | Mar 18 |
| 32°F | Apr 10 | Apr 3 | Mar 30 | Mar 25 | Mar 21 | Mar 17 | Mar 14 | Mar 9 | Mar 3 |
| 28°F | Mar 27 | Mar 19 | Mar 14 | Mar 11 | Mar 7 | Mar 3 | Mar 1 | Feb 25 | Feb 17 |
| 24°F | Mar 14 | Mar 7 | Mar 3 | Mar 1 | Feb 26 | Feb 21 | Feb 15 | Feb 8 | Jan 30 |
| 20°F | Mar 5 | Feb 28 | Feb 21 | Feb 15 | Feb 8 | Feb 2 | Jan 27 | Jan 20 | Jan 12 |
| 16°F | Feb 28 | Feb 15 | Feb 6 | Jan 31 | Jan 26 | Jan 19 | Jan 14 | Jan 5 | 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 18 | Nov 1 | Nov 16 |
| Freeze (32°F) | Oct 24 | Nov 8 | Nov 28 |
| Hard (28°F) | Nov 1 | Nov 19 | Dec 7 |
| Severe (24°F) | Nov 9 | Dec 1 | Dec 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 18 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 16 |
| 32°F | Oct 24 | Oct 30 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 15 | Nov 20 | Nov 28 |
| 28°F | Nov 1 | Nov 6 | Nov 11 | Nov 14 | Nov 19 | Nov 23 | Nov 28 | Dec 2 | Dec 7 |
| 24°F | Nov 9 | Nov 16 | Nov 23 | Nov 27 | Dec 1 | Dec 5 | Dec 9 | Dec 14 | Dec 21 |
| 20°F | Nov 23 | Nov 30 | Dec 6 | Dec 11 | Dec 17 | Dec 23 | Dec 30 | Jan 5 | Jan 16 |
| 16°F | Dec 4 | Dec 12 | Dec 19 | Dec 26 | Jan 1 | Jan 5 | Jan 12 | Jan 18 | Feb 1 |
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: Ardmore 7Wnw Mesonet, Ok, about 7.2 miles away@if(!empty($station['elevation_ft'])), at 928 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 Lone Grove, OK?
On average, the last spring frost (32°F) around Lone Grove, OK is about Mar 21. 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 Lone Grove, OK typically arrives about Nov 8. 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 21 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 231 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 73443 Planting calendar → Oklahoma frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026