Frost dates for 16937Mills, PA
The average last spring frost in Mills is May 4 and the average first fall frost is October 14, giving a typical growing season of about 163 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 4
- Average first fall frost
- Oct 14
- Growing season
- 163 days
Safer after May 21 (1-in-10 risk)
Possible by Sep 29 (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 29 · May 16 · May 30 | Sep 18 · Oct 1 · Oct 16 | 139 days | 100% |
| Frost / freeze (32°F) | Apr 20 · May 4 · May 21 | Sep 29 · Oct 14 · Nov 1 | 163 days | 100% |
| Hard freeze (28°F) | Apr 10 · Apr 24 · May 11 | Oct 10 · Oct 31 · Nov 13 | 187 days | 100% |
Planting calendar for Mills
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 16937 is matched to the NOAA station Wellsville Muni Ap, NY, 28.2 km away, at 2,124 ft elevation (159 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wellsville Muni Ap, NY (used) | 2,124 ft | May 4 | Oct 14 |
| Oswayo 1 Ene, PA | 1,710 ft | May 20 | Sep 29 |
| Wellsville, NY | 1,510 ft | May 15 | Oct 2 |
| Coudersport 7Se, PA | 2,150 ft | May 14 | Oct 4 |
Frost dates near Mills
- Harrison Valley, PA 16927 · last May 10, first Oct 5
- Genesee, PA 16941 · last May 4, first Oct 14
- Whitesville, NY 14897 · last May 4, first Oct 14
- Rexville, NY 14877 · last May 4, first Oct 14
- Ulysses, PA 16948 · last May 14, first Oct 4
- Sabinsville, PA 16943 · last May 10, first Oct 5
- Troupsburg, NY 14885 · last May 15, first Oct 2
- Westfield, PA 16950 · last May 6, first Oct 10
Frequently asked questions
- When is the last frost in Mills, PA?
- For ZIP code 16937, the average last spring frost (32°F) is May 4, based on NOAA 1991-2020 climate normals for the Wellsville Muni Ap, NY weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Mills, PA?
- The average first fall frost (32°F) is October 14. There is a 1-in-10 chance of frost by September 29, so tender plants are at risk from that point on.
- How long is the growing season in 16937?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 163 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.