Last spring frost
Mar 26
Frost Dates for Grayridge, MO
First fall frost
Nov 6
Growing season
225 days
Hardiness zone
7b
In an average year around Grayridge, MO, 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 8 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 21 | Apr 4 | Mar 20 |
| Freeze (32°F) | Apr 9 | Mar 26 | Mar 8 |
| Hard (28°F) | Mar 31 | Mar 14 | Feb 26 |
| Severe (24°F) | Mar 21 | Mar 4 | Feb 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 21 | Apr 15 | Apr 10 | Apr 7 | Apr 4 | Apr 2 | Mar 30 | Mar 26 | Mar 20 |
| 32°F | Apr 9 | Apr 5 | Apr 1 | Mar 30 | Mar 26 | Mar 22 | Mar 18 | Mar 14 | Mar 8 |
| 28°F | Mar 31 | Mar 26 | Mar 21 | Mar 18 | Mar 14 | Mar 11 | Mar 7 | Mar 3 | Feb 26 |
| 24°F | Mar 21 | Mar 16 | Mar 12 | Mar 8 | Mar 4 | Mar 1 | Feb 25 | Feb 19 | Feb 10 |
| 20°F | Mar 14 | Mar 7 | Mar 3 | Feb 27 | Feb 22 | Feb 16 | Feb 10 | Feb 5 | Jan 30 |
| 16°F | Mar 6 | Feb 27 | Feb 20 | Feb 13 | Feb 8 | Feb 3 | Jan 31 | Jan 23 | Jan 13 |
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 26 | Nov 8 |
| Freeze (32°F) | Oct 21 | Nov 6 | Nov 25 |
| Hard (28°F) | Nov 1 | Nov 19 | Dec 10 |
| Severe (24°F) | Nov 10 | Dec 2 | Dec 24 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 14 | Oct 19 | Oct 21 | Oct 24 | Oct 26 | Oct 28 | Oct 31 | Nov 3 | Nov 8 |
| 32°F | Oct 21 | Oct 27 | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 13 | Nov 17 | Nov 25 |
| 28°F | Nov 1 | Nov 6 | Nov 10 | Nov 14 | Nov 19 | Nov 24 | Nov 29 | Dec 3 | Dec 10 |
| 24°F | Nov 10 | Nov 18 | Nov 24 | Nov 29 | Dec 2 | Dec 6 | Dec 12 | Dec 18 | Dec 24 |
| 20°F | Nov 24 | Dec 1 | Dec 7 | Dec 12 | Dec 18 | Dec 23 | Dec 27 | Jan 1 | Jan 9 |
| 16°F | Dec 7 | Dec 14 | Dec 22 | Dec 26 | Dec 30 | Jan 3 | Jan 9 | Jan 15 | Jan 25 |
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: Sikeston Pwr Stn, Mo, about 10.4 miles away@if(!empty($station['elevation_ft'])), at 310 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 Grayridge, MO?
On average, the last spring frost (32°F) around Grayridge, MO is about Mar 26. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 8.
When is the first frost in the fall?
The first fall frost around Grayridge, MO 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 8 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 63846 Planting calendar → Missouri frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026