Frost dates for 17364Thomasville, PA
The average last spring frost in Thomasville is April 27 and the average first fall frost is October 18, giving a typical growing season of about 174 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 27
- Average first fall frost
- Oct 18
- Growing season
- 174 days
Safer after May 11 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 175 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 24 · May 8 · May 23 | Sep 26 · Oct 7 · Oct 20 | 153 days | 100% |
| Frost / freeze (32°F) | Apr 12 · Apr 27 · May 11 | Oct 4 · Oct 18 · Nov 1 | 174 days | 100% |
| Hard freeze (28°F) | Mar 30 · Apr 12 · Apr 29 | Oct 13 · Oct 30 · Nov 11 | 198 days | 100% |
Planting calendar for Thomasville
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 27 – Jun 2 |
| Tomatoes | Transplant outdoors | May 13 – Jun 28 |
| Peppers | Start seeds indoors | Mar 27 – Apr 27 |
| Peppers | Transplant outdoors | May 27 – Jun 27 |
| Eggplant | Start seeds indoors | Apr 13 – May 12 |
| Eggplant | Transplant outdoors | May 27 – Jun 27 |
| Cucumbers | Sow outdoors | May 27 – Jul 8 |
| Summer squash | Sow outdoors | May 13 – Jun 27 |
| Winter squash & pumpkins | Sow outdoors | May 27 – Jun 27 |
| Snap beans | Sow outdoors | May 13 – Jul 31 |
| Sweet corn | Sow outdoors | May 13 – Jun 28 |
| Watermelon & cantaloupe | Sow outdoors | May 27 – Jun 27 |
| Okra | Sow outdoors | May 20 – Jun 12 |
| Peas | Sow outdoors (spring) | Mar 27 – May 12 |
| Potatoes | Plant outdoors (spring) | Mar 27 – May 27 |
| Onions | Start seeds indoors (spring) | Feb 13 – Mar 12 |
| Onions | Transplant outdoors (spring) | Apr 13 – May 12 |
| Broccoli | Start seeds indoors (spring) | Mar 9 – Apr 12 |
| Broccoli | Transplant outdoors (spring) | Apr 13 – May 12 |
| Broccoli | Start seeds indoors (fall) | Jun 18 – Jun 28 |
| Broccoli | Transplant outdoors (fall) | Jul 18 – Jul 29 |
| Cabbage | Start seeds indoors (spring) | Feb 27 – Mar 27 |
| Cabbage | Transplant outdoors (spring) | Mar 27 – Apr 27 |
| Cabbage | Start seeds indoors (fall) | Jun 8 – Jul 8 |
| Cabbage | Transplant outdoors (fall) | Jul 8 – Aug 8 |
| Leaf lettuce | Sow outdoors (spring) | Mar 27 – Jun 12 |
| Leaf lettuce | Sow outdoors (fall) | Jul 8 – Aug 24 |
| Spinach | Sow outdoors (spring) | Mar 20 – May 3 |
| Spinach | Sow outdoors (fall) | Jul 25 – Aug 29 |
| Radishes | Sow outdoors (spring) | Mar 27 – May 17 |
| Radishes | Sow outdoors (fall) | Jul 8 – Sep 8 |
| Kale | Sow outdoors (spring) | Apr 13 – May 3 |
| Kale | Sow outdoors (fall) | Jul 1 – Aug 8 |
| Carrots | Sow outdoors (spring) | Apr 27 – Jun 12 |
| Carrots | Sow outdoors (fall) | Jun 8 – Jul 24 |
| Garlic | Plant outdoors (fall) | Oct 8 – Nov 8 |
Where these dates come from
ZIP code 17364 is matched to the NOAA station York Ap, PA, 2 km away, at 486 ft elevation (0 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| York Ap, PA (used) | 486 ft | Apr 27 | Oct 18 |
| York 3 Ssw Pump Stn, PA | 390 ft | Apr 26 | Oct 19 |
| Hanover 4 Sw, PA | 558 ft | Apr 24 | Oct 20 |
| Millers 4 Ne, MD | 860 ft | Apr 19 | Oct 25 |
Frost dates near Thomasville
- York, PA 17408 · last Apr 26, first Oct 19
- Dover, PA 17315 · last Apr 27, first Oct 18
- Spring Grove, PA 17362 · last Apr 27, first Oct 18
- York New Salem, PA 17371 · last Apr 27, first Oct 18
- Abbottstown, PA 17301 · last Apr 24, first Oct 20
- East Berlin, PA 17316 · last Apr 27, first Oct 18
- Porters Sideling, PA 17354 · last Apr 24, first Oct 20
- Codorus, PA 17311 · last Apr 26, first Oct 19
Frequently asked questions
- When is the last frost in Thomasville, PA?
- For ZIP code 17364, the average last spring frost (32°F) is April 27, based on NOAA 1991-2020 climate normals for the York Ap, PA weather station. There is a 1-in-10 chance of a frost after May 11.
- When is the first frost in Thomasville, PA?
- The average first fall frost (32°F) is October 18. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 17364?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 174 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.