Frost dates for 61864Philo, IL
The average last spring frost in Philo is April 19 and the average first fall frost is October 17, giving a typical growing season of about 180 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 19
- Average first fall frost
- Oct 17
- Growing season
- 180 days
Safer after May 5 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 170 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 17 · Apr 30 · May 15 | Sep 23 · Oct 8 · Oct 22 | 159 days | 100% |
| Frost / freeze (32°F) | Apr 6 · Apr 19 · May 5 | Oct 3 · Oct 17 · Oct 31 | 180 days | 100% |
| Hard freeze (28°F) | Mar 26 · Apr 8 · Apr 24 | Oct 15 · Oct 28 · Nov 11 | 201 days | 100% |
Planting calendar for Philo
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 19 – May 25 |
| Tomatoes | Transplant outdoors | May 5 – Jun 27 |
| Peppers | Start seeds indoors | Mar 19 – Apr 19 |
| Peppers | Transplant outdoors | May 19 – Jun 19 |
| Eggplant | Start seeds indoors | Apr 5 – May 4 |
| Eggplant | Transplant outdoors | May 19 – Jun 19 |
| Cucumbers | Sow outdoors | May 19 – Jul 7 |
| Summer squash | Sow outdoors | May 5 – Jun 19 |
| Winter squash & pumpkins | Sow outdoors | May 19 – Jun 19 |
| Snap beans | Sow outdoors | May 5 – Jul 30 |
| Sweet corn | Sow outdoors | May 5 – Jun 27 |
| Watermelon & cantaloupe | Sow outdoors | May 19 – Jun 19 |
| Okra | Sow outdoors | May 12 – Jun 4 |
| Peas | Sow outdoors (spring) | Mar 19 – May 4 |
| Potatoes | Plant outdoors (spring) | Mar 19 – May 19 |
| Onions | Start seeds indoors (spring) | Feb 5 – Mar 4 |
| Onions | Transplant outdoors (spring) | Apr 5 – May 4 |
| Broccoli | Start seeds indoors (spring) | Mar 1 – Apr 4 |
| Broccoli | Transplant outdoors (spring) | Apr 5 – May 4 |
| Broccoli | Start seeds indoors (fall) | Jun 17 – Jun 27 |
| Broccoli | Transplant outdoors (fall) | Jul 17 – Jul 28 |
| Cabbage | Start seeds indoors (spring) | Feb 19 – Mar 19 |
| Cabbage | Transplant outdoors (spring) | Mar 19 – Apr 19 |
| Cabbage | Start seeds indoors (fall) | Jun 7 – Jul 7 |
| Cabbage | Transplant outdoors (fall) | Jul 7 – Aug 7 |
| Leaf lettuce | Sow outdoors (spring) | Mar 19 – Jun 4 |
| Leaf lettuce | Sow outdoors (fall) | Jul 7 – Aug 23 |
| Spinach | Sow outdoors (spring) | Mar 12 – Apr 25 |
| Spinach | Sow outdoors (fall) | Jul 24 – Aug 28 |
| Radishes | Sow outdoors (spring) | Mar 19 – May 9 |
| Radishes | Sow outdoors (fall) | Jul 7 – Sep 7 |
| Kale | Sow outdoors (spring) | Apr 5 – Apr 25 |
| Kale | Sow outdoors (fall) | Jun 30 – Aug 7 |
| Carrots | Sow outdoors (spring) | Apr 19 – Jun 4 |
| Carrots | Sow outdoors (fall) | Jun 7 – Jul 23 |
| Garlic | Plant outdoors (fall) | Oct 7 – Nov 7 |
Where these dates come from
ZIP code 61864 is matched to the NOAA station Champaign Willard Ap, IL, 10.8 km away, at 754 ft elevation (19 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Champaign Willard Ap, IL (used) | 754 ft | Apr 19 | Oct 17 |
| Champaign 3S, IL | 721 ft | Apr 15 | Oct 24 |
| Champaign 9 Sw, IL | 700 ft | Apr 23 | Oct 13 |
| Ogden, IL | 675 ft | Apr 20 | Oct 21 |
Frost dates near Philo
- Urbana, IL 61802 · last Apr 15, first Oct 24
- Sidney, IL 61877 · last Apr 15, first Oct 24
- Tolono, IL 61880 · last Apr 19, first Oct 17
- Savoy, IL 61874 · last Apr 15, first Oct 24
- Longview, IL 61852 · last Apr 19, first Oct 19
- Champaign, IL 61820 · last Apr 15, first Oct 24
- Pesotum, IL 61863 · last Apr 19, first Oct 17
- Villa Grove, IL 61956 · last Apr 15, first Oct 20
Frequently asked questions
- When is the last frost in Philo, IL?
- For ZIP code 61864, the average last spring frost (32°F) is April 19, based on NOAA 1991-2020 climate normals for the Champaign Willard Ap, IL weather station. There is a 1-in-10 chance of a frost after May 5.
- When is the first frost in Philo, IL?
- The average first fall frost (32°F) is October 17. 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 61864?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 180 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.