Last spring frost
Apr 10
Frost Dates for Ozawkie, KS
First fall frost
Oct 29
Growing season
199 days
Hardiness zone
6b
In an average year around Ozawkie, KS, the last spring frost (32°F) is about Apr 10 and the first fall frost is about Oct 29, giving roughly a 199-day growing season. To be safe most years, wait until Mar 27 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 4 | Apr 21 | Apr 6 |
| Freeze (32°F) | Apr 25 | Apr 10 | Mar 27 |
| Hard (28°F) | Apr 16 | Apr 1 | Mar 14 |
| Severe (24°F) | Apr 7 | Mar 23 | Mar 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 4 | May 1 | Apr 28 | Apr 24 | Apr 21 | Apr 18 | Apr 15 | Apr 11 | Apr 6 |
| 32°F | Apr 25 | Apr 21 | Apr 18 | Apr 14 | Apr 10 | Apr 7 | Apr 4 | Mar 31 | Mar 27 |
| 28°F | Apr 16 | Apr 11 | Apr 6 | Apr 3 | Apr 1 | Mar 30 | Mar 26 | Mar 21 | Mar 14 |
| 24°F | Apr 7 | Apr 2 | Mar 30 | Mar 26 | Mar 23 | Mar 19 | Mar 14 | Mar 9 | Mar 3 |
| 20°F | Mar 31 | Mar 24 | Mar 19 | Mar 15 | Mar 11 | Mar 8 | Mar 4 | Mar 1 | Feb 25 |
| 16°F | Mar 21 | Mar 14 | Mar 10 | Mar 6 | Mar 3 | Feb 28 | Feb 26 | Feb 22 | Feb 15 |
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 1 | Oct 18 | Oct 30 |
| Freeze (32°F) | Oct 12 | Oct 29 | Nov 10 |
| Hard (28°F) | Oct 24 | Nov 6 | Nov 22 |
| Severe (24°F) | Nov 1 | Nov 15 | Dec 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 1 | Oct 7 | Oct 12 | Oct 16 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 30 |
| 32°F | Oct 12 | Oct 18 | Oct 22 | Oct 26 | Oct 29 | Nov 1 | Nov 2 | Nov 5 | Nov 10 |
| 28°F | Oct 24 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 22 |
| 24°F | Nov 1 | Nov 4 | Nov 8 | Nov 12 | Nov 15 | Nov 19 | Nov 23 | Nov 28 | Dec 2 |
| 20°F | Nov 7 | Nov 14 | Nov 18 | Nov 22 | Nov 27 | Nov 30 | Dec 2 | Dec 6 | Dec 12 |
| 16°F | Nov 18 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 8 | Dec 12 | Dec 16 | Dec 22 |
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: Valley Falls 3 Sw, Ks, about 6.6 miles away@if(!empty($station['elevation_ft'])), at 1,051 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 Ozawkie, KS?
On average, the last spring frost (32°F) around Ozawkie, KS is about Apr 10. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 27.
When is the first frost in the fall?
The first fall frost around Ozawkie, KS typically arrives about Oct 29. 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 10 on average, or Mar 27 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 199 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 66070 Planting calendar → Kansas frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026