Frost dates for 66760Opolis, KS
The average last spring frost in Opolis is April 7 and the average first fall frost is October 30, giving a typical growing season of about 203 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 7
- Average first fall frost
- Oct 30
- Growing season
- 203 days
Safer after Apr 24 (1-in-10 risk)
Possible by Oct 17 (1-in-10 risk)
First frost typically in 3 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 3 · Apr 18 · May 2 | Oct 5 · Oct 21 · Nov 2 | 184 days | 100% |
| Frost / freeze (32°F) | Mar 24 · Apr 7 · Apr 24 | Oct 17 · Oct 30 · Nov 10 | 203 days | 100% |
| Hard freeze (28°F) | Mar 12 · Mar 29 · Apr 12 | Oct 25 · Nov 6 · Nov 21 | 222 days | 100% |
Planting calendar for Opolis
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 7 – May 13 |
| Tomatoes | Transplant outdoors | Apr 23 – Jul 10 |
| Peppers | Start seeds indoors | Mar 7 – Apr 7 |
| Peppers | Transplant outdoors | May 7 – Jun 7 |
| Eggplant | Start seeds indoors | Mar 24 – Apr 22 |
| Eggplant | Transplant outdoors | May 7 – Jun 7 |
| Cucumbers | Sow outdoors | May 7 – Jul 20 |
| Summer squash | Sow outdoors | Apr 23 – Jun 7 |
| Winter squash & pumpkins | Sow outdoors | May 7 – Jun 7 |
| Snap beans | Sow outdoors | Apr 23 – Aug 12 |
| Sweet corn | Sow outdoors | Apr 23 – Jul 10 |
| Watermelon & cantaloupe | Sow outdoors | May 7 – Jun 7 |
| Okra | Sow outdoors | Apr 30 – May 23 |
| Peas | Sow outdoors (spring) | Mar 7 – Apr 22 |
| Potatoes | Plant outdoors (spring) | Mar 7 – May 7 |
| Onions | Start seeds indoors (spring) | Jan 24 – Feb 20 |
| Onions | Transplant outdoors (spring) | Mar 24 – Apr 22 |
| Broccoli | Start seeds indoors (spring) | Feb 17 – Mar 23 |
| Broccoli | Transplant outdoors (spring) | Mar 24 – Apr 22 |
| Broccoli | Start seeds indoors (fall) | Jun 30 – Jul 10 |
| Broccoli | Transplant outdoors (fall) | Jul 30 – Aug 10 |
| Cabbage | Start seeds indoors (spring) | Feb 7 – Mar 7 |
| Cabbage | Transplant outdoors (spring) | Mar 7 – Apr 7 |
| Cabbage | Start seeds indoors (fall) | Jun 20 – Jul 20 |
| Cabbage | Transplant outdoors (fall) | Jul 20 – Aug 20 |
| Leaf lettuce | Sow outdoors (spring) | Mar 7 – May 23 |
| Leaf lettuce | Sow outdoors (fall) | Jul 20 – Sep 5 |
| Spinach | Sow outdoors (spring) | Feb 28 – Apr 13 |
| Spinach | Sow outdoors (fall) | Aug 6 – Sep 10 |
| Radishes | Sow outdoors (spring) | Mar 7 – Apr 27 |
| Radishes | Sow outdoors (fall) | Jul 20 – Sep 20 |
| Kale | Sow outdoors (spring) | Mar 24 – Apr 13 |
| Kale | Sow outdoors (fall) | Jul 13 – Aug 20 |
| Carrots | Sow outdoors (spring) | Apr 7 – May 23 |
| Carrots | Sow outdoors (fall) | Jun 20 – Aug 5 |
| Garlic | Plant outdoors (fall) | Oct 20 – Nov 20 |
Where these dates come from
ZIP code 66760 is matched to the NOAA station Pittsburg, KS, 9.1 km away, at 908 ft elevation (14 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Pittsburg, KS (used) | 908 ft | Apr 7 | Oct 30 |
| Joplin 24 N, MO | 952 ft | Apr 6 | Oct 24 |
| Joplin Regional Airport, MO | 980 ft | Apr 9 | Oct 27 |
| Girard, KS | 990 ft | Apr 4 | Nov 1 |
Frost dates near Opolis
- Asbury, MO 64832 · last Apr 9, first Oct 27
- Pittsburg, KS 66762 · last Apr 7, first Oct 30
- Weir, KS 66781 · last Apr 5, first Oct 31
- Mindenmines, MO 64769 · last Apr 6, first Oct 24
- Frontenac, KS 66763 · last Apr 4, first Nov 1
- Oronogo, MO 64855 · last Apr 9, first Oct 27
- Scammon, KS 66773 · last Apr 5, first Oct 31
- Neck City, MO 64849 · last Apr 9, first Oct 27
Frequently asked questions
- When is the last frost in Opolis, KS?
- For ZIP code 66760, the average last spring frost (32°F) is April 7, based on NOAA 1991-2020 climate normals for the Pittsburg, KS weather station. There is a 1-in-10 chance of a frost after April 24.
- When is the first frost in Opolis, KS?
- The average first fall frost (32°F) is October 30. There is a 1-in-10 chance of frost by October 17, so tender plants are at risk from that point on.
- How long is the growing season in 66760?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 203 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.