Frost dates for 67478Simpson, KS
The average last spring frost in Simpson is April 19 and the average first fall frost is October 19, giving a typical growing season of about 181 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 19
- Average first fall frost
- Oct 19
- Growing season
- 181 days
Safer after May 2 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 174 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 15 · Apr 29 · May 12 | Sep 28 · Oct 11 · Oct 22 | 162 days | 100% |
| Frost / freeze (32°F) | Apr 5 · Apr 19 · May 2 | Oct 4 · Oct 19 · Oct 31 | 181 days | 100% |
| Hard freeze (28°F) | Mar 24 · Apr 8 · Apr 23 | Oct 15 · Oct 27 · Nov 11 | 202 days | 100% |
Planting calendar for Simpson
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 19 – May 25 |
| Tomatoes | Transplant outdoors | May 5 – Jun 29 |
| Peppers | Start seeds indoors | Mar 19 – Apr 19 |
| Peppers | Transplant outdoors | May 19 – Jun 19 |
| Eggplant | Start seeds indoors | Apr 5 – May 4 |
| Eggplant | Transplant outdoors | May 19 – Jun 19 |
| Cucumbers | Sow outdoors | May 19 – Jul 9 |
| Summer squash | Sow outdoors | May 5 – Jun 19 |
| Winter squash & pumpkins | Sow outdoors | May 19 – Jun 19 |
| Snap beans | Sow outdoors | May 5 – Aug 1 |
| Sweet corn | Sow outdoors | May 5 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 19 – Jun 19 |
| Okra | Sow outdoors | May 12 – Jun 4 |
| Peas | Sow outdoors (spring) | Mar 19 – May 4 |
| Potatoes | Plant outdoors (spring) | Mar 19 – May 19 |
| Onions | Start seeds indoors (spring) | Feb 5 – Mar 4 |
| Onions | Transplant outdoors (spring) | Apr 5 – May 4 |
| Broccoli | Start seeds indoors (spring) | Mar 1 – Apr 4 |
| Broccoli | Transplant outdoors (spring) | Apr 5 – May 4 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 19 – Mar 19 |
| Cabbage | Transplant outdoors (spring) | Mar 19 – Apr 19 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 19 – Jun 4 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 12 – Apr 25 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 19 – May 9 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 5 – Apr 25 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 19 – Jun 4 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 67478 is matched to the NOAA station Beloit, KS, 17.4 km away, at 1,391 ft elevation (59 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Beloit, KS (used) | 1,391 ft | Apr 19 | Oct 19 |
| Concordia 1 W, KS | 1,481 ft | Apr 21 | Oct 19 |
| Concordia Muni Ap, KS | 1,469 ft | Apr 18 | Oct 19 |
| Minneapolis, KS | 1,306 ft | Apr 20 | Oct 19 |
Frost dates near Simpson
- Glasco, KS 67445 · last Apr 19, first Oct 19
- Beloit, KS 67420 · last Apr 19, first Oct 19
- Delphos, KS 67436 · last Apr 20, first Oct 19
- Jamestown, KS 66948 · last Apr 21, first Oct 19
- Barnard, KS 67418 · last Apr 28, first Oct 15
- Randall, KS 66963 · last Apr 17, first Oct 21
- Concordia, KS 66901 · last Apr 18, first Oct 19
- Glen Elder, KS 67446 · last Apr 29, first Oct 15
Frequently asked questions
- When is the last frost in Simpson, KS?
- For ZIP code 67478, the average last spring frost (32°F) is April 19, based on NOAA 1991-2020 climate normals for the Beloit, KS weather station. There is a 1-in-10 chance of a frost after May 2.
- When is the first frost in Simpson, KS?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 67478?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 181 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.