Frost dates for 17370York Haven, PA
The average last spring frost in York Haven is April 9 and the average first fall frost is November 2, giving a typical growing season of about 206 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 9
- Average first fall frost
- Nov 2
- Growing season
- 206 days
Safer after Apr 25 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
Last frost typically in 157 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 9 · Apr 23 · May 7 | Oct 9 · Oct 22 · Nov 4 | 183 days | 100% |
| Frost / freeze (32°F) | Mar 28 · Apr 9 · Apr 25 | Oct 18 · Nov 2 · Nov 15 | 206 days | 100% |
| Hard freeze (28°F) | Mar 14 · Mar 30 · Apr 9 | Oct 31 · Nov 14 · Nov 29 | 230 days | 100% |
Planting calendar for York Haven
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 9 – May 15 |
| Tomatoes | Transplant outdoors | Apr 25 – Jul 13 |
| Peppers | Start seeds indoors | Mar 9 – Apr 9 |
| Peppers | Transplant outdoors | May 9 – Jun 9 |
| Eggplant | Start seeds indoors | Mar 26 – Apr 24 |
| Eggplant | Transplant outdoors | May 9 – Jun 9 |
| Cucumbers | Sow outdoors | May 9 – Jul 23 |
| Summer squash | Sow outdoors | Apr 25 – Jun 9 |
| Winter squash & pumpkins | Sow outdoors | May 9 – Jun 9 |
| Snap beans | Sow outdoors | Apr 25 – Aug 15 |
| Sweet corn | Sow outdoors | Apr 25 – Jul 13 |
| Watermelon & cantaloupe | Sow outdoors | May 9 – Jun 9 |
| Okra | Sow outdoors | May 2 – May 25 |
| Peas | Sow outdoors (spring) | Mar 9 – Apr 24 |
| Potatoes | Plant outdoors (spring) | Mar 9 – May 9 |
| Onions | Start seeds indoors (spring) | Jan 26 – Feb 22 |
| Onions | Transplant outdoors (spring) | Mar 26 – Apr 24 |
| Broccoli | Start seeds indoors (spring) | Feb 19 – Mar 25 |
| Broccoli | Transplant outdoors (spring) | Mar 26 – Apr 24 |
| Broccoli | Start seeds indoors (fall) | Jul 3 – Jul 13 |
| Broccoli | Transplant outdoors (fall) | Aug 2 – Aug 13 |
| Cabbage | Start seeds indoors (spring) | Feb 9 – Mar 9 |
| Cabbage | Transplant outdoors (spring) | Mar 9 – Apr 9 |
| Cabbage | Start seeds indoors (fall) | Jun 23 – Jul 23 |
| Cabbage | Transplant outdoors (fall) | Jul 23 – Aug 23 |
| Leaf lettuce | Sow outdoors (spring) | Mar 9 – May 25 |
| Leaf lettuce | Sow outdoors (fall) | Jul 23 – Sep 8 |
| Spinach | Sow outdoors (spring) | Mar 2 – Apr 15 |
| Spinach | Sow outdoors (fall) | Aug 9 – Sep 13 |
| Radishes | Sow outdoors (spring) | Mar 9 – Apr 29 |
| Radishes | Sow outdoors (fall) | Jul 23 – Sep 23 |
| Kale | Sow outdoors (spring) | Mar 26 – Apr 15 |
| Kale | Sow outdoors (fall) | Jul 16 – Aug 23 |
| Carrots | Sow outdoors (spring) | Apr 9 – May 25 |
| Carrots | Sow outdoors (fall) | Jun 23 – Aug 8 |
| Garlic | Plant outdoors (fall) | Oct 23 – Nov 23 |
Where these dates come from
ZIP code 17370 is matched to the NOAA station Middletown Harrisburg Intl Ap, PA, 8 km away, at 312 ft elevation (347 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Middletown Harrisburg Intl Ap, PA (used) | 312 ft | Apr 9 | Nov 2 |
| Harrisburg Cptl Cy Ap, PA | 340 ft | Apr 9 | Nov 1 |
| Harrisburg 1 Ne, PA | 420 ft | Apr 15 | Oct 23 |
| York 3 Ssw Pump Stn, PA | 390 ft | Apr 26 | Oct 19 |
Frost dates near York Haven
- Etters, PA 17319 · last Apr 9, first Nov 2
- Manchester, PA 17345 · last Apr 26, first Oct 19
- Lewisberry, PA 17339 · last Apr 9, first Nov 1
- Mount Wolf, PA 17347 · last Apr 26, first Oct 19
- Bainbridge, PA 17502 · last Apr 9, first Nov 2
- Highspire, PA 17034 · last Apr 9, first Nov 2
- Middletown, PA 17057 · last Apr 9, first Nov 2
- Emigsville, PA 17318 · last Apr 26, first Oct 19
Frequently asked questions
- When is the last frost in York Haven, PA?
- For ZIP code 17370, the average last spring frost (32°F) is April 9, based on NOAA 1991-2020 climate normals for the Middletown Harrisburg Intl Ap, PA weather station. There is a 1-in-10 chance of a frost after April 25.
- When is the first frost in York Haven, PA?
- The average first fall frost (32°F) is November 2. There is a 1-in-10 chance of frost by October 18, so tender plants are at risk from that point on.
- How long is the growing season in 17370?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 206 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.