Frost dates for 61332Leonore, IL
The average last spring frost in Leonore is April 24 and the average first fall frost is October 18, giving a typical growing season of about 176 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 24
- Average first fall frost
- Oct 18
- Growing season
- 176 days
Safer after May 8 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 175 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 21 · May 4 · May 19 | Sep 23 · Oct 6 · Oct 20 | 155 days | 100% |
| Frost / freeze (32°F) | Apr 11 · Apr 24 · May 8 | Oct 3 · Oct 18 · Oct 28 | 176 days | 100% |
| Hard freeze (28°F) | Mar 31 · Apr 13 · Apr 27 | Oct 16 · Oct 28 · Nov 8 | 197 days | 100% |
Planting calendar for Leonore
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 24 – May 30 |
| Tomatoes | Transplant outdoors | May 10 – Jun 28 |
| Peppers | Start seeds indoors | Mar 24 – Apr 24 |
| Peppers | Transplant outdoors | May 24 – Jun 24 |
| Eggplant | Start seeds indoors | Apr 10 – May 9 |
| Eggplant | Transplant outdoors | May 24 – Jun 24 |
| Cucumbers | Sow outdoors | May 24 – Jul 8 |
| Summer squash | Sow outdoors | May 10 – Jun 24 |
| Winter squash & pumpkins | Sow outdoors | May 24 – Jun 24 |
| Snap beans | Sow outdoors | May 10 – Jul 31 |
| Sweet corn | Sow outdoors | May 10 – Jun 28 |
| Watermelon & cantaloupe | Sow outdoors | May 24 – Jun 24 |
| Okra | Sow outdoors | May 17 – Jun 9 |
| Peas | Sow outdoors (spring) | Mar 24 – May 9 |
| Potatoes | Plant outdoors (spring) | Mar 24 – May 24 |
| Onions | Start seeds indoors (spring) | Feb 10 – Mar 9 |
| Onions | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (spring) | Mar 6 – Apr 9 |
| Broccoli | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (fall) | Jun 18 – Jun 28 |
| Broccoli | Transplant outdoors (fall) | Jul 18 – Jul 29 |
| Cabbage | Start seeds indoors (spring) | Feb 24 – Mar 24 |
| Cabbage | Transplant outdoors (spring) | Mar 24 – Apr 24 |
| Cabbage | Start seeds indoors (fall) | Jun 8 – Jul 8 |
| Cabbage | Transplant outdoors (fall) | Jul 8 – Aug 8 |
| Leaf lettuce | Sow outdoors (spring) | Mar 24 – Jun 9 |
| Leaf lettuce | Sow outdoors (fall) | Jul 8 – Aug 24 |
| Spinach | Sow outdoors (spring) | Mar 17 – Apr 30 |
| Spinach | Sow outdoors (fall) | Jul 25 – Aug 29 |
| Radishes | Sow outdoors (spring) | Mar 24 – May 14 |
| Radishes | Sow outdoors (fall) | Jul 8 – Sep 8 |
| Kale | Sow outdoors (spring) | Apr 10 – Apr 30 |
| Kale | Sow outdoors (fall) | Jul 1 – Aug 8 |
| Carrots | Sow outdoors (spring) | Apr 24 – Jun 9 |
| Carrots | Sow outdoors (fall) | Jun 8 – Jul 24 |
| Garlic | Plant outdoors (fall) | Oct 8 – Nov 8 |
Where these dates come from
ZIP code 61332 is matched to the NOAA station Peru, IL, 20.8 km away, at 620 ft elevation (59 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Peru, IL (used) | 620 ft | Apr 24 | Oct 18 |
| Ottawa 5Sw, IL | 525 ft | Apr 20 | Oct 22 |
| Streator 3 Se, IL | 610 ft | Apr 12 | Oct 28 |
| Marseilles Lock, IL | 490 ft | Apr 27 | Oct 17 |
Frost dates near Leonore
- Lostant, IL 61334 · last Apr 24, first Oct 18
- Tonica, IL 61370 · last Apr 24, first Oct 18
- Oglesby, IL 61348 · last Apr 24, first Oct 18
- Cedar Point, IL 61316 · last Apr 24, first Oct 18
- Streator, IL 61364 · last Apr 12, first Oct 28
- Grand Ridge, IL 61325 · last Apr 20, first Oct 22
- Wenona, IL 61377 · last Apr 26, first Oct 17
- Standard, IL 61363 · last Apr 24, first Oct 18
Frequently asked questions
- When is the last frost in Leonore, IL?
- For ZIP code 61332, the average last spring frost (32°F) is April 24, based on NOAA 1991-2020 climate normals for the Peru, IL weather station. There is a 1-in-10 chance of a frost after May 8.
- When is the first frost in Leonore, IL?
- The average first fall frost (32°F) is October 18. There is a 1-in-10 chance of frost by October 3, so tender plants are at risk from that point on.
- How long is the growing season in 61332?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 176 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.