Frost dates for 62223Belleville, IL
The average last spring frost in Belleville is April 8 and the average first fall frost is October 26, giving a typical growing season of about 200 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 8
- Average first fall frost
- Oct 26
- Growing season
- 200 days
Safer after Apr 23 (1-in-10 risk)
Possible by Oct 12 (1-in-10 risk)
Last frost typically in 161 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 4 · Apr 19 · May 4 | Oct 3 · Oct 17 · Oct 28 | 178 days | 100% |
| Frost / freeze (32°F) | Mar 23 · Apr 8 · Apr 23 | Oct 12 · Oct 26 · Nov 7 | 200 days | 100% |
| Hard freeze (28°F) | Mar 10 · Mar 28 · Apr 12 | Oct 24 · Nov 6 · Nov 24 | 224 days | 100% |
Planting calendar for Belleville
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 8 – May 14 |
| Tomatoes | Transplant outdoors | Apr 24 – Jul 6 |
| Peppers | Start seeds indoors | Mar 8 – Apr 8 |
| Peppers | Transplant outdoors | May 8 – Jun 8 |
| Eggplant | Start seeds indoors | Mar 25 – Apr 23 |
| Eggplant | Transplant outdoors | May 8 – Jun 8 |
| Cucumbers | Sow outdoors | May 8 – Jul 16 |
| Summer squash | Sow outdoors | Apr 24 – Jun 8 |
| Winter squash & pumpkins | Sow outdoors | May 8 – Jun 8 |
| Snap beans | Sow outdoors | Apr 24 – Aug 8 |
| Sweet corn | Sow outdoors | Apr 24 – Jul 6 |
| Watermelon & cantaloupe | Sow outdoors | May 8 – Jun 8 |
| Okra | Sow outdoors | May 1 – May 24 |
| Peas | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Potatoes | Plant outdoors (spring) | Mar 8 – May 8 |
| Onions | Start seeds indoors (spring) | Jan 25 – Feb 21 |
| Onions | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (spring) | Feb 18 – Mar 24 |
| Broccoli | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (fall) | Jun 26 – Jul 6 |
| Broccoli | Transplant outdoors (fall) | Jul 26 – Aug 6 |
| Cabbage | Start seeds indoors (spring) | Feb 8 – Mar 8 |
| Cabbage | Transplant outdoors (spring) | Mar 8 – Apr 8 |
| Cabbage | Start seeds indoors (fall) | Jun 16 – Jul 16 |
| Cabbage | Transplant outdoors (fall) | Jul 16 – Aug 16 |
| Leaf lettuce | Sow outdoors (spring) | Mar 8 – May 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 16 – Sep 1 |
| Spinach | Sow outdoors (spring) | Mar 1 – Apr 14 |
| Spinach | Sow outdoors (fall) | Aug 2 – Sep 6 |
| Radishes | Sow outdoors (spring) | Mar 8 – Apr 28 |
| Radishes | Sow outdoors (fall) | Jul 16 – Sep 16 |
| Kale | Sow outdoors (spring) | Mar 25 – Apr 14 |
| Kale | Sow outdoors (fall) | Jul 9 – Aug 16 |
| Carrots | Sow outdoors (spring) | Apr 8 – May 24 |
| Carrots | Sow outdoors (fall) | Jun 16 – Aug 1 |
| Garlic | Plant outdoors (fall) | Oct 16 – Nov 16 |
Where these dates come from
ZIP code 62223 is matched to the NOAA station Cahokia St Louis Ap, IL, 10.8 km away, at 413 ft elevation (145 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Cahokia St Louis Ap, IL (used) | 413 ft | Apr 8 | Oct 26 |
| Cahokia, IL | 400 ft | Apr 6 | Oct 27 |
| Belleville Siu Rsch, IL | 450 ft | Apr 12 | Oct 20 |
| St Louis Sci Ctr, MO | 515 ft | Apr 1 | Nov 4 |
Frost dates near Belleville
- Belleville, IL 62226 · last Apr 12, first Oct 20
- Fairview Heights, IL 62208 · last Apr 8, first Oct 26
- East Saint Louis, IL 62203 · last Apr 8, first Oct 26
- Caseyville, IL 62232 · last Apr 8, first Oct 26
- Millstadt, IL 62260 · last Apr 8, first Oct 26
- Lovejoy, IL 62059 · last Apr 12, first Oct 20
- O Fallon, IL 62269 · last Apr 12, first Oct 20
- Smithton, IL 62285 · last Apr 12, first Oct 20
Frequently asked questions
- When is the last frost in Belleville, IL?
- For ZIP code 62223, the average last spring frost (32°F) is April 8, based on NOAA 1991-2020 climate normals for the Cahokia St Louis Ap, IL weather station. There is a 1-in-10 chance of a frost after April 23.
- When is the first frost in Belleville, IL?
- The average first fall frost (32°F) is October 26. There is a 1-in-10 chance of frost by October 12, so tender plants are at risk from that point on.
- How long is the growing season in 62223?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 200 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.