Frost dates for 16134Jamestown, PA
The average last spring frost in Jamestown is May 4 and the average first fall frost is October 14, giving a typical growing season of about 161 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 4
- Average first fall frost
- Oct 14
- Growing season
- 161 days
Safer after May 22 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 182 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 30 · May 18 · May 31 | Sep 19 · Oct 4 · Oct 18 | 138 days | 100% |
| Frost / freeze (32°F) | Apr 22 · May 4 · May 22 | Oct 1 · Oct 14 · Nov 1 | 161 days | 100% |
| Hard freeze (28°F) | Apr 11 · Apr 25 · May 11 | Oct 11 · Oct 30 · Nov 13 | 187 days | 100% |
Planting calendar for Jamestown
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 | Apr 3 – Jun 9 |
| Tomatoes | Transplant outdoors | May 20 – Jun 24 |
| Peppers | Start seeds indoors | Apr 3 – May 4 |
| Peppers | Transplant outdoors | Jun 3 – Jul 4 |
| Eggplant | Start seeds indoors | Apr 20 – May 19 |
| Eggplant | Transplant outdoors | Jun 3 – Jul 4 |
| Cucumbers | Sow outdoors | Jun 3 – Jul 4 |
| Summer squash | Sow outdoors | May 20 – Jul 4 |
| Winter squash & pumpkins | Sow outdoors | Jun 3 – Jul 4 |
| Snap beans | Sow outdoors | May 20 – Jul 27 |
| Sweet corn | Sow outdoors | May 20 – Jun 24 |
| Watermelon & cantaloupe | Sow outdoors | Jun 3 – Jul 4 |
| Okra | Sow outdoors | May 27 – Jun 19 |
| Peas | Sow outdoors (spring) | Apr 3 – May 19 |
| Potatoes | Plant outdoors (spring) | Apr 3 – Jun 3 |
| Onions | Start seeds indoors (spring) | Feb 20 – Mar 19 |
| Onions | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (spring) | Mar 16 – Apr 19 |
| Broccoli | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (fall) | Jun 14 – Jun 24 |
| Broccoli | Transplant outdoors (fall) | Jul 14 – Jul 25 |
| Cabbage | Start seeds indoors (spring) | Mar 6 – Apr 3 |
| Cabbage | Transplant outdoors (spring) | Apr 3 – May 4 |
| Cabbage | Start seeds indoors (fall) | Jun 4 – Jul 4 |
| Cabbage | Transplant outdoors (fall) | Jul 4 – Aug 4 |
| Leaf lettuce | Sow outdoors (spring) | Apr 3 – Jun 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 4 – Aug 20 |
| Spinach | Sow outdoors (spring) | Mar 27 – May 10 |
| Spinach | Sow outdoors (fall) | Jul 21 – Aug 25 |
| Radishes | Sow outdoors (spring) | Apr 3 – May 24 |
| Radishes | Sow outdoors (fall) | Jul 4 – Sep 4 |
| Kale | Sow outdoors (spring) | Apr 20 – May 10 |
| Kale | Sow outdoors (fall) | Jun 27 – Aug 4 |
| Carrots | Sow outdoors (spring) | May 4 – Jun 19 |
| Carrots | Sow outdoors (fall) | Jun 4 – Jul 20 |
| Garlic | Plant outdoors (fall) | Oct 4 – Nov 4 |
Where these dates come from
ZIP code 16134 is matched to the NOAA station Jamestown 2 Nw, PA, 5 km away, at 1,040 ft elevation (112 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Jamestown 2 Nw, PA (used) | 1,040 ft | May 4 | Oct 14 |
| Linesville 1 S, PA | 1,030 ft | Apr 30 | Oct 23 |
| Port Meadville Ap, PA | 1,400 ft | Apr 30 | Oct 23 |
| Youngstown Rgnl Ap, OH | 1,180 ft | May 1 | Oct 17 |
Frost dates near Jamestown
- Adamsville, PA 16110 · last May 4, first Oct 14
- Greenville, PA 16125 · last May 4, first Oct 14
- Kinsman, OH 44428 · last May 4, first Oct 14
- Hartstown, PA 16131 · last May 4, first Oct 14
- Transfer, PA 16154 · last May 4, first Oct 14
- Williamsfield, OH 44093 · last May 4, first Oct 14
- Burghill, OH 44404 · last May 4, first Oct 14
- Atlantic, PA 16111 · last Apr 30, first Oct 23
Frequently asked questions
- When is the last frost in Jamestown, PA?
- For ZIP code 16134, the average last spring frost (32°F) is May 4, based on NOAA 1991-2020 climate normals for the Jamestown 2 Nw, PA weather station. There is a 1-in-10 chance of a frost after May 22.
- When is the first frost in Jamestown, PA?
- The average first fall frost (32°F) is October 14. There is a 1-in-10 chance of frost by October 1, so tender plants are at risk from that point on.
- How long is the growing season in 16134?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 161 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.