Frost dates for 62271Okawville, IL
The average last spring frost in Okawville is April 7 and the average first fall frost is October 26, giving a typical growing season of about 201 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 7
- Average first fall frost
- Oct 26
- Growing season
- 201 days
Safer after Apr 22 (1-in-10 risk)
Possible by Oct 14 (1-in-10 risk)
Last frost typically in 159 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 6 · Apr 19 · May 4 | Oct 4 · Oct 16 · Oct 27 | 180 days | 100% |
| Frost / freeze (32°F) | Mar 24 · Apr 7 · Apr 22 | Oct 14 · Oct 26 · Nov 6 | 201 days | 100% |
| Hard freeze (28°F) | Mar 13 · Mar 30 · Apr 12 | Oct 24 · Nov 4 · Nov 19 | 221 days | 100% |
Planting calendar for Okawville
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 6 |
| 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 16 |
| Summer squash | Sow outdoors | Apr 23 – Jun 7 |
| Winter squash & pumpkins | Sow outdoors | May 7 – Jun 7 |
| Snap beans | Sow outdoors | Apr 23 – Aug 8 |
| Sweet corn | Sow outdoors | Apr 23 – Jul 6 |
| 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 26 – Jul 6 |
| Broccoli | Transplant outdoors (fall) | Jul 26 – Aug 6 |
| Cabbage | Start seeds indoors (spring) | Feb 7 – Mar 7 |
| Cabbage | Transplant outdoors (spring) | Mar 7 – Apr 7 |
| Cabbage | Start seeds indoors (fall) | Jun 16 – Jul 16 |
| Cabbage | Transplant outdoors (fall) | Jul 16 – Aug 16 |
| Leaf lettuce | Sow outdoors (spring) | Mar 7 – May 23 |
| Leaf lettuce | Sow outdoors (fall) | Jul 16 – Sep 1 |
| Spinach | Sow outdoors (spring) | Feb 28 – Apr 13 |
| Spinach | Sow outdoors (fall) | Aug 2 – Sep 6 |
| Radishes | Sow outdoors (spring) | Mar 7 – Apr 27 |
| Radishes | Sow outdoors (fall) | Jul 16 – Sep 16 |
| Kale | Sow outdoors (spring) | Mar 24 – Apr 13 |
| Kale | Sow outdoors (fall) | Jul 9 – Aug 16 |
| Carrots | Sow outdoors (spring) | Apr 7 – May 23 |
| Carrots | Sow outdoors (fall) | Jun 16 – Aug 1 |
| Garlic | Plant outdoors (fall) | Oct 16 – Nov 16 |
Where these dates come from
ZIP code 62271 is matched to the NOAA station Nashville 1 E, IL, 17.4 km away, at 513 ft elevation (73 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Nashville 1 E, IL (used) | 513 ft | Apr 7 | Oct 26 |
| Carlyle Rsvr, IL | 501 ft | Apr 6 | Oct 29 |
| Belleville Siu Rsch, IL | 450 ft | Apr 12 | Oct 20 |
| Sparta 1 W, IL | 535 ft | Apr 12 | Oct 22 |
Frost dates near Okawville
- Addieville, IL 62214 · last Apr 7, first Oct 26
- Germantown, IL 62245 · last Apr 6, first Oct 29
- Bartelso, IL 62218 · last Apr 6, first Oct 29
- Albers, IL 62215 · last Apr 12, first Oct 20
- New Memphis, IL 62266 · last Apr 12, first Oct 20
- Nashville, IL 62263 · last Apr 7, first Oct 26
- Saint Libory, IL 62282 · last Apr 12, first Oct 20
- New Baden, IL 62265 · last Apr 12, first Oct 20
Frequently asked questions
- When is the last frost in Okawville, IL?
- For ZIP code 62271, the average last spring frost (32°F) is April 7, based on NOAA 1991-2020 climate normals for the Nashville 1 E, IL weather station. There is a 1-in-10 chance of a frost after April 22.
- When is the first frost in Okawville, IL?
- The average first fall frost (32°F) is October 26. There is a 1-in-10 chance of frost by October 14, so tender plants are at risk from that point on.
- How long is the growing season in 62271?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 201 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.