Frost dates for 17728Cogan Station, PA
The average last spring frost in Cogan Station is April 25 and the average first fall frost is October 24, giving a typical growing season of about 181 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 25
- Average first fall frost
- Oct 24
- Growing season
- 181 days
Safer after May 12 (1-in-10 risk)
Possible by Oct 8 (1-in-10 risk)
Last frost typically in 173 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 21 · May 7 · May 23 | Sep 29 · Oct 11 · Oct 25 | 158 days | 100% |
| Frost / freeze (32°F) | Apr 10 · Apr 25 · May 12 | Oct 8 · Oct 24 · Nov 5 | 181 days | 100% |
| Hard freeze (28°F) | Mar 29 · Apr 10 · Apr 25 | Oct 20 · Nov 4 · Nov 18 | 206 days | 100% |
Planting calendar for Cogan Station
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 25 – May 31 |
| Tomatoes | Transplant outdoors | May 11 – Jul 4 |
| Peppers | Start seeds indoors | Mar 25 – Apr 25 |
| Peppers | Transplant outdoors | May 25 – Jun 25 |
| Eggplant | Start seeds indoors | Apr 11 – May 10 |
| Eggplant | Transplant outdoors | May 25 – Jun 25 |
| Cucumbers | Sow outdoors | May 25 – Jul 14 |
| Summer squash | Sow outdoors | May 11 – Jun 25 |
| Winter squash & pumpkins | Sow outdoors | May 25 – Jun 25 |
| Snap beans | Sow outdoors | May 11 – Aug 6 |
| Sweet corn | Sow outdoors | May 11 – Jul 4 |
| Watermelon & cantaloupe | Sow outdoors | May 25 – Jun 25 |
| Okra | Sow outdoors | May 18 – Jun 10 |
| Peas | Sow outdoors (spring) | Mar 25 – May 10 |
| Potatoes | Plant outdoors (spring) | Mar 25 – May 25 |
| Onions | Start seeds indoors (spring) | Feb 11 – Mar 10 |
| Onions | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (spring) | Mar 7 – Apr 10 |
| Broccoli | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (fall) | Jun 24 – Jul 4 |
| Broccoli | Transplant outdoors (fall) | Jul 24 – Aug 4 |
| Cabbage | Start seeds indoors (spring) | Feb 25 – Mar 25 |
| Cabbage | Transplant outdoors (spring) | Mar 25 – Apr 25 |
| Cabbage | Start seeds indoors (fall) | Jun 14 – Jul 14 |
| Cabbage | Transplant outdoors (fall) | Jul 14 – Aug 14 |
| Leaf lettuce | Sow outdoors (spring) | Mar 25 – Jun 10 |
| Leaf lettuce | Sow outdoors (fall) | Jul 14 – Aug 30 |
| Spinach | Sow outdoors (spring) | Mar 18 – May 1 |
| Spinach | Sow outdoors (fall) | Jul 31 – Sep 4 |
| Radishes | Sow outdoors (spring) | Mar 25 – May 15 |
| Radishes | Sow outdoors (fall) | Jul 14 – Sep 14 |
| Kale | Sow outdoors (spring) | Apr 11 – May 1 |
| Kale | Sow outdoors (fall) | Jul 7 – Aug 14 |
| Carrots | Sow outdoors (spring) | Apr 25 – Jun 10 |
| Carrots | Sow outdoors (fall) | Jun 14 – Jul 30 |
| Garlic | Plant outdoors (fall) | Oct 14 – Nov 14 |
Where these dates come from
ZIP code 17728 is matched to the NOAA station Williamsport 2, PA, 10.3 km away, at 525 ft elevation (315 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Williamsport 2, PA (used) | 525 ft | Apr 25 | Oct 24 |
| Williamsport, PA | 520 ft | Apr 24 | Oct 23 |
| Lock Haven Sewage Plt, PA | 566 ft | Apr 30 | Oct 20 |
| Canton, PA | 1,140 ft | May 16 | Oct 2 |
Frost dates near Cogan Station
- Williamsport, PA 17705 · last Apr 25, first Oct 24
- Linden, PA 17744 · last Apr 25, first Oct 24
- Trout Run, PA 17771 · last May 6, first Oct 7
- Montoursville, PA 17754 · last Apr 24, first Oct 23
- Jersey Shore, PA 17740 · last May 5, first Oct 6
- Antes Fort, PA 17720 · last Apr 30, first Oct 20
- Montgomery, PA 17752 · last Apr 24, first Oct 23
- Allenwood, PA 17810 · last Apr 24, first Oct 23
Frequently asked questions
- When is the last frost in Cogan Station, PA?
- For ZIP code 17728, the average last spring frost (32°F) is April 25, based on NOAA 1991-2020 climate normals for the Williamsport 2, PA weather station. There is a 1-in-10 chance of a frost after May 12.
- When is the first frost in Cogan Station, PA?
- The average first fall frost (32°F) is October 24. There is a 1-in-10 chance of frost by October 8, so tender plants are at risk from that point on.
- How long is the growing season in 17728?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 181 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.