Frost dates for 67431Chapman, KS
The average last spring frost in Chapman is April 17 and the average first fall frost is October 20, giving a typical growing season of about 184 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 17
- Average first fall frost
- Oct 20
- Growing season
- 184 days
Safer after Apr 30 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 165 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 14 · Apr 28 · May 9 | Sep 26 · Oct 10 · Oct 22 | 165 days | 100% |
| Frost / freeze (32°F) | Apr 2 · Apr 17 · Apr 30 | Oct 3 · Oct 20 · Nov 2 | 184 days | 100% |
| Hard freeze (28°F) | Mar 22 · Apr 7 · Apr 21 | Oct 16 · Oct 30 · Nov 13 | 205 days | 100% |
Planting calendar for Chapman
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 17 – May 23 |
| Tomatoes | Transplant outdoors | May 3 – Jun 30 |
| Peppers | Start seeds indoors | Mar 17 – Apr 17 |
| Peppers | Transplant outdoors | May 17 – Jun 17 |
| Eggplant | Start seeds indoors | Apr 3 – May 2 |
| Eggplant | Transplant outdoors | May 17 – Jun 17 |
| Cucumbers | Sow outdoors | May 17 – Jul 10 |
| Summer squash | Sow outdoors | May 3 – Jun 17 |
| Winter squash & pumpkins | Sow outdoors | May 17 – Jun 17 |
| Snap beans | Sow outdoors | May 3 – Aug 2 |
| Sweet corn | Sow outdoors | May 3 – Jun 30 |
| Watermelon & cantaloupe | Sow outdoors | May 17 – Jun 17 |
| Okra | Sow outdoors | May 10 – Jun 2 |
| Peas | Sow outdoors (spring) | Mar 17 – May 2 |
| Potatoes | Plant outdoors (spring) | Mar 17 – May 17 |
| Onions | Start seeds indoors (spring) | Feb 3 – Mar 2 |
| Onions | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (spring) | Feb 27 – Apr 2 |
| Broccoli | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (fall) | Jun 20 – Jun 30 |
| Broccoli | Transplant outdoors (fall) | Jul 20 – Jul 31 |
| Cabbage | Start seeds indoors (spring) | Feb 17 – Mar 17 |
| Cabbage | Transplant outdoors (spring) | Mar 17 – Apr 17 |
| Cabbage | Start seeds indoors (fall) | Jun 10 – Jul 10 |
| Cabbage | Transplant outdoors (fall) | Jul 10 – Aug 10 |
| Leaf lettuce | Sow outdoors (spring) | Mar 17 – Jun 2 |
| Leaf lettuce | Sow outdoors (fall) | Jul 10 – Aug 26 |
| Spinach | Sow outdoors (spring) | Mar 10 – Apr 23 |
| Spinach | Sow outdoors (fall) | Jul 27 – Aug 31 |
| Radishes | Sow outdoors (spring) | Mar 17 – May 7 |
| Radishes | Sow outdoors (fall) | Jul 10 – Sep 10 |
| Kale | Sow outdoors (spring) | Apr 3 – Apr 23 |
| Kale | Sow outdoors (fall) | Jul 3 – Aug 10 |
| Carrots | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Carrots | Sow outdoors (fall) | Jun 10 – Jul 26 |
| Garlic | Plant outdoors (fall) | Oct 10 – Nov 10 |
Where these dates come from
ZIP code 67431 is matched to the NOAA station Chapman, KS, 1 km away, at 1,111 ft elevation (1 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chapman, KS (used) | 1,111 ft | Apr 17 | Oct 20 |
| Milford Lake, KS | 1,213 ft | Apr 12 | Oct 26 |
| Abilene, KS | 1,187 ft | Apr 14 | Oct 23 |
| Manhattan Muni Ap, KS | 1,057 ft | Apr 21 | Oct 16 |
Frost dates near Chapman
- Enterprise, KS 67441 · last Apr 14, first Oct 23
- Junction City, KS 66441 · last Apr 12, first Oct 26
- Abilene, KS 67410 · last Apr 14, first Oct 23
- Woodbine, KS 67492 · last Apr 24, first Oct 14
- Talmage, KS 67482 · last Apr 14, first Oct 23
- Fort Riley, KS 66442 · last Apr 12, first Oct 26
- Milford, KS 66514 · last Apr 12, first Oct 26
- Wakefield, KS 67487 · last Apr 19, first Oct 19
Frequently asked questions
- When is the last frost in Chapman, KS?
- For ZIP code 67431, the average last spring frost (32°F) is April 17, based on NOAA 1991-2020 climate normals for the Chapman, KS weather station. There is a 1-in-10 chance of a frost after April 30.
- When is the first frost in Chapman, KS?
- The average first fall frost (32°F) is October 20. 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 67431?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 184 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.