Frost dates for 47567Petersburg, IN
The average last spring frost in Petersburg is April 20 and the average first fall frost is October 22, giving a typical growing season of about 186 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 20
- Average first fall frost
- Oct 22
- Growing season
- 186 days
Safer after May 4 (1-in-10 risk)
Possible by Oct 8 (1-in-10 risk)
Last frost typically in 169 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 16 · Apr 30 · May 14 | Sep 30 · Oct 12 · Oct 25 | 166 days | 100% |
| Frost / freeze (32°F) | Apr 6 · Apr 20 · May 4 | Oct 8 · Oct 22 · Nov 2 | 186 days | 100% |
| Hard freeze (28°F) | Mar 24 · Apr 7 · Apr 21 | Oct 20 · Nov 1 · Nov 17 | 207 days | 100% |
Planting calendar for Petersburg
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 20 – May 26 |
| Tomatoes | Transplant outdoors | May 6 – Jul 2 |
| Peppers | Start seeds indoors | Mar 20 – Apr 20 |
| Peppers | Transplant outdoors | May 20 – Jun 20 |
| Eggplant | Start seeds indoors | Apr 6 – May 5 |
| Eggplant | Transplant outdoors | May 20 – Jun 20 |
| Cucumbers | Sow outdoors | May 20 – Jul 12 |
| Summer squash | Sow outdoors | May 6 – Jun 20 |
| Winter squash & pumpkins | Sow outdoors | May 20 – Jun 20 |
| Snap beans | Sow outdoors | May 6 – Aug 4 |
| Sweet corn | Sow outdoors | May 6 – Jul 2 |
| Watermelon & cantaloupe | Sow outdoors | May 20 – Jun 20 |
| Okra | Sow outdoors | May 13 – Jun 5 |
| Peas | Sow outdoors (spring) | Mar 20 – May 5 |
| Potatoes | Plant outdoors (spring) | Mar 20 – May 20 |
| Onions | Start seeds indoors (spring) | Feb 6 – Mar 5 |
| Onions | Transplant outdoors (spring) | Apr 6 – May 5 |
| Broccoli | Start seeds indoors (spring) | Mar 2 – Apr 5 |
| Broccoli | Transplant outdoors (spring) | Apr 6 – May 5 |
| Broccoli | Start seeds indoors (fall) | Jun 22 – Jul 2 |
| Broccoli | Transplant outdoors (fall) | Jul 22 – Aug 2 |
| Cabbage | Start seeds indoors (spring) | Feb 20 – Mar 20 |
| Cabbage | Transplant outdoors (spring) | Mar 20 – Apr 20 |
| Cabbage | Start seeds indoors (fall) | Jun 12 – Jul 12 |
| Cabbage | Transplant outdoors (fall) | Jul 12 – Aug 12 |
| Leaf lettuce | Sow outdoors (spring) | Mar 20 – Jun 5 |
| Leaf lettuce | Sow outdoors (fall) | Jul 12 – Aug 28 |
| Spinach | Sow outdoors (spring) | Mar 13 – Apr 26 |
| Spinach | Sow outdoors (fall) | Jul 29 – Sep 2 |
| Radishes | Sow outdoors (spring) | Mar 20 – May 10 |
| Radishes | Sow outdoors (fall) | Jul 12 – Sep 12 |
| Kale | Sow outdoors (spring) | Apr 6 – Apr 26 |
| Kale | Sow outdoors (fall) | Jul 5 – Aug 12 |
| Carrots | Sow outdoors (spring) | Apr 20 – Jun 5 |
| Carrots | Sow outdoors (fall) | Jun 12 – Jul 28 |
| Garlic | Plant outdoors (fall) | Oct 12 – Nov 12 |
Where these dates come from
ZIP code 47567 is matched to the NOAA station Petersburg 61 Brg, IN, 2.5 km away, at 472 ft elevation (39 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Petersburg 61 Brg, IN (used) | 472 ft | Apr 20 | Oct 22 |
| Washington 1 W, IN | 482 ft | Apr 10 | Oct 25 |
| Stendal, IN | 635 ft | Apr 6 | Oct 30 |
| Princeton 1 W, IN | 480 ft | Apr 13 | Oct 25 |
Frost dates near Petersburg
- Winslow, IN 47598 · last Apr 20, first Oct 22
- Monroe City, IN 47557 · last Apr 10, first Oct 25
- Otwell, IN 47564 · last Apr 20, first Oct 22
- Oakland City, IN 47660 · last Apr 20, first Oct 22
- Hazleton, IN 47640 · last Apr 13, first Oct 25
- Velpen, IN 47590 · last Apr 6, first Oct 30
- Wheatland, IN 47597 · last Apr 10, first Oct 25
- Francisco, IN 47649 · last Apr 13, first Oct 25
Frequently asked questions
- When is the last frost in Petersburg, IN?
- For ZIP code 47567, the average last spring frost (32°F) is April 20, based on NOAA 1991-2020 climate normals for the Petersburg 61 Brg, IN weather station. There is a 1-in-10 chance of a frost after May 4.
- When is the first frost in Petersburg, IN?
- The average first fall frost (32°F) is October 22. There is a 1-in-10 chance of frost by October 8, so tender plants are at risk from that point on.
- How long is the growing season in 47567?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 186 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.