Frost dates for 16740Mount Jewett, PA
The average last spring frost in Mount Jewett is May 18 and the average first fall frost is October 1, giving a typical growing season of about 136 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 18
- Average first fall frost
- Oct 1
- Growing season
- 136 days
Safer after May 31 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 196 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) | May 17 · Jun 1 · Jun 18 | Aug 29 · Sep 19 · Oct 1 | 106 days | 100% |
| Frost / freeze (32°F) | Apr 30 · May 18 · May 31 | Sep 18 · Oct 1 · Oct 15 | 136 days | 100% |
| Hard freeze (28°F) | Apr 18 · May 3 · May 21 | Sep 30 · Oct 14 · Nov 2 | 166 days | 100% |
Planting calendar for Mount Jewett
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 17 – Jun 23 |
| Tomatoes | Transplant outdoors | Jun 3 – Jun 11 |
| Peppers | Start seeds indoors | Apr 17 – May 18 |
| Peppers | Transplant outdoors | Jun 17 – Jul 18 |
| Eggplant | Start seeds indoors | May 4 – Jun 2 |
| Eggplant | Transplant outdoors | Jun 17 – Jul 18 |
| Cucumbers | Sow outdoors | Jun 17 – Jun 21 |
| Summer squash | Sow outdoors | Jun 3 – Jul 18 |
| Winter squash & pumpkins | Sow outdoors | Jun 17 – Jul 18 |
| Snap beans | Sow outdoors | Jun 3 – Jul 14 |
| Sweet corn | Sow outdoors | Jun 3 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 17 – Jul 18 |
| Okra | Sow outdoors | Jun 10 – Jul 3 |
| Peas | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Potatoes | Plant outdoors (spring) | Apr 17 – Jun 17 |
| Onions | Start seeds indoors (spring) | Mar 6 – Apr 2 |
| Onions | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (spring) | Mar 30 – May 3 |
| Broccoli | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 20 – Apr 17 |
| Cabbage | Transplant outdoors (spring) | Apr 17 – May 18 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 17 – Jul 3 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 10 – May 24 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 17 – Jun 7 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | May 4 – May 24 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 18 – Jul 3 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 16740 is matched to the NOAA station Bradford Rgnl Ap, PA, 8.7 km away, at 2,117 ft elevation (78 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bradford Rgnl Ap, PA (used) | 2,117 ft | May 18 | Oct 1 |
| Clermont 1 Nw, PA | 2,080 ft | May 15 | Oct 3 |
| Kane 1Nne, PA | 1,750 ft | May 24 | Sep 28 |
| Glen Hazel 2 Ne Dam, PA | 1,720 ft | May 14 | Oct 6 |
Frost dates near Mount Jewett
- Hazel Hurst, PA 16733 · last May 14, first Oct 6
- Lewis Run, PA 16738 · last May 18, first Oct 1
- Cyclone, PA 16726 · last May 18, first Oct 1
- Kane, PA 16735 · last May 24, first Sep 28
- Gifford, PA 16732 · last May 18, first Oct 1
- Smethport, PA 16749 · last May 18, first Oct 4
- Wilcox, PA 15870 · last May 14, first Oct 6
- James City, PA 16734 · last May 24, first Sep 28
Frequently asked questions
- When is the last frost in Mount Jewett, PA?
- For ZIP code 16740, the average last spring frost (32°F) is May 18, based on NOAA 1991-2020 climate normals for the Bradford Rgnl Ap, PA weather station. There is a 1-in-10 chance of a frost after May 31.
- When is the first frost in Mount Jewett, PA?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 16740?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 136 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.