Frost dates for 66535Saint George, KS
The average last spring frost in Saint George is April 18 and the average first fall frost is October 19, giving a typical growing season of about 183 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 18
- Average first fall frost
- Oct 19
- Growing season
- 183 days
Safer after May 2 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 173 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 13 · Apr 28 · May 10 | Sep 26 · Oct 10 · Oct 22 | 164 days | 100% |
| Frost / freeze (32°F) | Apr 4 · Apr 18 · May 2 | Oct 3 · Oct 19 · Nov 1 | 183 days | 100% |
| Hard freeze (28°F) | Mar 25 · Apr 8 · Apr 23 | Oct 14 · Oct 28 · Nov 10 | 203 days | 100% |
Planting calendar for Saint George
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 18 – May 24 |
| Tomatoes | Transplant outdoors | May 4 – Jun 29 |
| Peppers | Start seeds indoors | Mar 18 – Apr 18 |
| Peppers | Transplant outdoors | May 18 – Jun 18 |
| Eggplant | Start seeds indoors | Apr 4 – May 3 |
| Eggplant | Transplant outdoors | May 18 – Jun 18 |
| Cucumbers | Sow outdoors | May 18 – Jul 9 |
| Summer squash | Sow outdoors | May 4 – Jun 18 |
| Winter squash & pumpkins | Sow outdoors | May 18 – Jun 18 |
| Snap beans | Sow outdoors | May 4 – Aug 1 |
| Sweet corn | Sow outdoors | May 4 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 18 – Jun 18 |
| Okra | Sow outdoors | May 11 – Jun 3 |
| Peas | Sow outdoors (spring) | Mar 18 – May 3 |
| Potatoes | Plant outdoors (spring) | Mar 18 – May 18 |
| Onions | Start seeds indoors (spring) | Feb 4 – Mar 3 |
| Onions | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (spring) | Feb 28 – Apr 3 |
| Broccoli | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 18 – Mar 18 |
| Cabbage | Transplant outdoors (spring) | Mar 18 – Apr 18 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 18 – Jun 3 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 11 – Apr 24 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 18 – May 8 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 4 – Apr 24 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 66535 is matched to the NOAA station Wamego 4 W, KS, 5.6 km away, at 1,166 ft elevation (11 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wamego 4 W, KS (used) | 1,166 ft | Apr 18 | Oct 19 |
| Manhattan, KS | 1,060 ft | Apr 16 | Oct 19 |
| Tuttle Creek Lake, KS | 1,058 ft | Apr 22 | Oct 20 |
| Manhattan 6 Ssw, KS | 1,137 ft | Apr 19 | Oct 17 |
Frost dates near Saint George
- Wamego, KS 66547 · last Apr 18, first Oct 19
- Manhattan, KS 66506 · last Apr 16, first Oct 19
- Belvue, KS 66407 · last Apr 18, first Oct 19
- Westmoreland, KS 66549 · last Apr 18, first Oct 19
- Mc Farland, KS 66501 · last Apr 18, first Oct 19
- Alma, KS 66401 · last Apr 18, first Oct 19
- Ogden, KS 66517 · last Apr 21, first Oct 16
- Paxico, KS 66526 · last Apr 18, first Oct 19
Frequently asked questions
- When is the last frost in Saint George, KS?
- For ZIP code 66535, the average last spring frost (32°F) is April 18, based on NOAA 1991-2020 climate normals for the Wamego 4 W, KS weather station. There is a 1-in-10 chance of a frost after May 2.
- When is the first frost in Saint George, KS?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 3, so tender plants are at risk from that point on.
- How long is the growing season in 66535?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 183 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.