Frost dates for 16927Harrison Valley, PA
The average last spring frost in Harrison Valley is May 10 and the average first fall frost is October 5, giving a typical growing season of about 148 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 10
- Average first fall frost
- Oct 5
- Growing season
- 148 days
Safer after May 26 (1-in-10 risk)
Possible by Sep 23 (1-in-10 risk)
Last frost typically in 190 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 7 · May 23 · Jun 4 | Sep 13 · Sep 26 · Oct 7 | 125 days | 100% |
| Frost / freeze (32°F) | Apr 25 · May 10 · May 26 | Sep 23 · Oct 5 · Oct 20 | 148 days | 100% |
| Hard freeze (28°F) | Apr 14 · Apr 28 · May 15 | Oct 3 · Oct 17 · Nov 2 | 172 days | 100% |
Planting calendar for Harrison Valley
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 9 – Jun 15 |
| Tomatoes | Transplant outdoors | May 26 – Jun 15 |
| Peppers | Start seeds indoors | Apr 9 – May 10 |
| Peppers | Transplant outdoors | Jun 9 – Jul 10 |
| Eggplant | Start seeds indoors | Apr 26 – May 25 |
| Eggplant | Transplant outdoors | Jun 9 – Jul 10 |
| Cucumbers | Sow outdoors | Jun 9 – Jun 25 |
| Summer squash | Sow outdoors | May 26 – Jul 10 |
| Winter squash & pumpkins | Sow outdoors | Jun 9 – Jul 10 |
| Snap beans | Sow outdoors | May 26 – Jul 18 |
| Sweet corn | Sow outdoors | May 26 – Jun 15 |
| Watermelon & cantaloupe | Sow outdoors | Jun 9 – Jul 10 |
| Okra | Sow outdoors | Jun 2 – Jun 25 |
| Peas | Sow outdoors (spring) | Apr 9 – May 25 |
| Potatoes | Plant outdoors (spring) | Apr 9 – Jun 9 |
| Onions | Start seeds indoors (spring) | Feb 26 – Mar 25 |
| Onions | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (spring) | Mar 22 – Apr 25 |
| Broccoli | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (fall) | Jun 5 – Jun 15 |
| Broccoli | Transplant outdoors (fall) | Jul 5 – Jul 16 |
| Cabbage | Start seeds indoors (spring) | Mar 12 – Apr 9 |
| Cabbage | Transplant outdoors (spring) | Apr 9 – May 10 |
| Cabbage | Start seeds indoors (fall) | May 26 – Jun 25 |
| Cabbage | Transplant outdoors (fall) | Jun 25 – Jul 26 |
| Leaf lettuce | Sow outdoors (spring) | Apr 9 – Jun 25 |
| Leaf lettuce | Sow outdoors (fall) | Jun 25 – Aug 11 |
| Spinach | Sow outdoors (spring) | Apr 2 – May 16 |
| Spinach | Sow outdoors (fall) | Jul 12 – Aug 16 |
| Radishes | Sow outdoors (spring) | Apr 9 – May 30 |
| Radishes | Sow outdoors (fall) | Jun 25 – Aug 26 |
| Kale | Sow outdoors (spring) | Apr 26 – May 16 |
| Kale | Sow outdoors (fall) | Jun 18 – Jul 26 |
| Carrots | Sow outdoors (spring) | May 10 – Jun 25 |
| Carrots | Sow outdoors (fall) | May 26 – Jul 11 |
| Garlic | Plant outdoors (fall) | Sep 25 – Oct 26 |
Where these dates come from
ZIP code 16927 is matched to the NOAA station Wellsboro 4 Sw, PA, 36.5 km away, at 1,818 ft elevation (46 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wellsboro 4 Sw, PA (used) | 1,818 ft | May 10 | Oct 5 |
| Oswayo 1 Ene, PA | 1,710 ft | May 20 | Sep 29 |
| Wellsville, NY | 1,510 ft | May 15 | Oct 2 |
| Wellsville Muni Ap, NY | 2,124 ft | May 4 | Oct 14 |
Frost dates near Harrison Valley
- Mills, PA 16937 · last May 4, first Oct 14
- Genesee, PA 16941 · last May 4, first Oct 14
- Westfield, PA 16950 · last May 6, first Oct 10
- Rexville, NY 14877 · last May 4, first Oct 14
- Ulysses, PA 16948 · last May 14, first Oct 4
- Troupsburg, NY 14885 · last May 15, first Oct 2
- Sabinsville, PA 16943 · last May 10, first Oct 5
- Whitesville, NY 14897 · last May 4, first Oct 14
Frequently asked questions
- When is the last frost in Harrison Valley, PA?
- For ZIP code 16927, the average last spring frost (32°F) is May 10, based on NOAA 1991-2020 climate normals for the Wellsboro 4 Sw, PA weather station. There is a 1-in-10 chance of a frost after May 26.
- When is the first frost in Harrison Valley, PA?
- The average first fall frost (32°F) is October 5. There is a 1-in-10 chance of frost by September 23, so tender plants are at risk from that point on.
- How long is the growing season in 16927?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 148 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.