Frost dates for 66062Olathe, KS
The average last spring frost in Olathe is April 10 and the average first fall frost is October 29, giving a typical growing season of about 202 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 10
- Average first fall frost
- Oct 29
- Growing season
- 202 days
Safer after Apr 24 (1-in-10 risk)
Possible by Oct 13 (1-in-10 risk)
First frost typically in 2 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 5 · Apr 19 · May 2 | Oct 2 · Oct 20 · Oct 31 | 181 days | 100% |
| Frost / freeze (32°F) | Mar 27 · Apr 10 · Apr 24 | Oct 13 · Oct 29 · Nov 12 | 202 days | 100% |
| Hard freeze (28°F) | Mar 13 · Mar 31 · Apr 17 | Oct 23 · Nov 6 · Nov 25 | 223 days | 100% |
Planting calendar for Olathe
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 10 – May 16 |
| Tomatoes | Transplant outdoors | Apr 26 – Jul 9 |
| Peppers | Start seeds indoors | Mar 10 – Apr 10 |
| Peppers | Transplant outdoors | May 10 – Jun 10 |
| Eggplant | Start seeds indoors | Mar 27 – Apr 25 |
| Eggplant | Transplant outdoors | May 10 – Jun 10 |
| Cucumbers | Sow outdoors | May 10 – Jul 19 |
| Summer squash | Sow outdoors | Apr 26 – Jun 10 |
| Winter squash & pumpkins | Sow outdoors | May 10 – Jun 10 |
| Snap beans | Sow outdoors | Apr 26 – Aug 11 |
| Sweet corn | Sow outdoors | Apr 26 – Jul 9 |
| Watermelon & cantaloupe | Sow outdoors | May 10 – Jun 10 |
| Okra | Sow outdoors | May 3 – May 26 |
| Peas | Sow outdoors (spring) | Mar 10 – Apr 25 |
| Potatoes | Plant outdoors (spring) | Mar 10 – May 10 |
| Onions | Start seeds indoors (spring) | Jan 27 – Feb 23 |
| Onions | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (spring) | Feb 20 – Mar 26 |
| Broccoli | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (fall) | Jun 29 – Jul 9 |
| Broccoli | Transplant outdoors (fall) | Jul 29 – Aug 9 |
| Cabbage | Start seeds indoors (spring) | Feb 10 – Mar 10 |
| Cabbage | Transplant outdoors (spring) | Mar 10 – Apr 10 |
| Cabbage | Start seeds indoors (fall) | Jun 19 – Jul 19 |
| Cabbage | Transplant outdoors (fall) | Jul 19 – Aug 19 |
| Leaf lettuce | Sow outdoors (spring) | Mar 10 – May 26 |
| Leaf lettuce | Sow outdoors (fall) | Jul 19 – Sep 4 |
| Spinach | Sow outdoors (spring) | Mar 3 – Apr 16 |
| Spinach | Sow outdoors (fall) | Aug 5 – Sep 9 |
| Radishes | Sow outdoors (spring) | Mar 10 – Apr 30 |
| Radishes | Sow outdoors (fall) | Jul 19 – Sep 19 |
| Kale | Sow outdoors (spring) | Mar 27 – Apr 16 |
| Kale | Sow outdoors (fall) | Jul 12 – Aug 19 |
| Carrots | Sow outdoors (spring) | Apr 10 – May 26 |
| Carrots | Sow outdoors (fall) | Jun 19 – Aug 4 |
| Garlic | Plant outdoors (fall) | Oct 19 – Nov 19 |
Where these dates come from
ZIP code 66062 is matched to the NOAA station Olathe 3E, KS, 2 km away, at 1,055 ft elevation (38 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Olathe 3E, KS (used) | 1,055 ft | Apr 10 | Oct 29 |
| Olathe Johnson Co Exec Ap, KS | 1,070 ft | Apr 8 | Oct 29 |
| Olathe Johnson Co Ap, KS | 1,087 ft | Apr 13 | Oct 24 |
| Bonner Springs, KS | 850 ft | Apr 16 | Oct 22 |
Frost dates near Olathe
- Olathe, KS 66061 · last Apr 10, first Oct 29
- Overland Park, KS 66221 · last Apr 8, first Oct 29
- Shawnee Mission, KS 66276 · last Apr 10, first Oct 29
- Lenexa, KS 66215 · last Apr 10, first Oct 29
- New Century, KS 66031 · last Apr 13, first Oct 24
- Spring Hill, KS 66083 · last Apr 13, first Oct 24
- Stilwell, KS 66085 · last Apr 8, first Oct 29
- Gardner, KS 66030 · last Apr 13, first Oct 24
Frequently asked questions
- When is the last frost in Olathe, KS?
- For ZIP code 66062, the average last spring frost (32°F) is April 10, based on NOAA 1991-2020 climate normals for the Olathe 3E, KS weather station. There is a 1-in-10 chance of a frost after April 24.
- When is the first frost in Olathe, KS?
- The average first fall frost (32°F) is October 29. There is a 1-in-10 chance of frost by October 13, so tender plants are at risk from that point on.
- How long is the growing season in 66062?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 202 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.