Frost dates for 16724Crosby, PA
The average last spring frost in Crosby is May 15 and the average first fall frost is October 6, giving a typical growing season of about 144 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 15
- Average first fall frost
- Oct 6
- Growing season
- 144 days
Safer after May 29 (1-in-10 risk)
Possible by Sep 25 (1-in-10 risk)
Last frost typically in 193 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 11 · May 28 · Jun 10 | Sep 14 · Sep 27 · Oct 8 | 123 days | 100% |
| Frost / freeze (32°F) | Apr 29 · May 15 · May 29 | Sep 25 · Oct 6 · Oct 21 | 144 days | 100% |
| Hard freeze (28°F) | Apr 20 · May 2 · May 20 | Oct 4 · Oct 20 · Nov 4 | 167 days | 100% |
Planting calendar for Crosby
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 14 – Jun 20 |
| Tomatoes | Transplant outdoors | May 31 – Jun 16 |
| Peppers | Start seeds indoors | Apr 14 – May 15 |
| Peppers | Transplant outdoors | Jun 14 – Jul 15 |
| Eggplant | Start seeds indoors | May 1 – May 30 |
| Eggplant | Transplant outdoors | Jun 14 – Jul 15 |
| Cucumbers | Sow outdoors | Jun 14 – Jun 26 |
| Summer squash | Sow outdoors | May 31 – Jul 15 |
| Winter squash & pumpkins | Sow outdoors | Jun 14 – Jul 15 |
| Snap beans | Sow outdoors | May 31 – Jul 19 |
| Sweet corn | Sow outdoors | May 31 – Jun 16 |
| Watermelon & cantaloupe | Sow outdoors | Jun 14 – Jul 15 |
| Okra | Sow outdoors | Jun 7 – Jun 30 |
| Peas | Sow outdoors (spring) | Apr 14 – May 30 |
| Potatoes | Plant outdoors (spring) | Apr 14 – Jun 14 |
| Onions | Start seeds indoors (spring) | Mar 3 – Mar 30 |
| Onions | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (spring) | Mar 27 – Apr 30 |
| Broccoli | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (fall) | Jun 6 – Jun 16 |
| Broccoli | Transplant outdoors (fall) | Jul 6 – Jul 17 |
| Cabbage | Start seeds indoors (spring) | Mar 17 – Apr 14 |
| Cabbage | Transplant outdoors (spring) | Apr 14 – May 15 |
| Cabbage | Start seeds indoors (fall) | May 27 – Jun 26 |
| Cabbage | Transplant outdoors (fall) | Jun 26 – Jul 27 |
| Leaf lettuce | Sow outdoors (spring) | Apr 14 – Jun 30 |
| Leaf lettuce | Sow outdoors (fall) | Jun 26 – Aug 12 |
| Spinach | Sow outdoors (spring) | Apr 7 – May 21 |
| Spinach | Sow outdoors (fall) | Jul 13 – Aug 17 |
| Radishes | Sow outdoors (spring) | Apr 14 – Jun 4 |
| Radishes | Sow outdoors (fall) | Jun 26 – Aug 27 |
| Kale | Sow outdoors (spring) | May 1 – May 21 |
| Kale | Sow outdoors (fall) | Jun 19 – Jul 27 |
| Carrots | Sow outdoors (spring) | May 15 – Jun 30 |
| Carrots | Sow outdoors (fall) | May 27 – Jul 12 |
| Garlic | Plant outdoors (fall) | Sep 26 – Oct 27 |
Where these dates come from
ZIP code 16724 is matched to the NOAA station Port Allegany, PA, 11.6 km away, at 1,475 ft elevation (34 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Port Allegany, PA (used) | 1,475 ft | May 15 | Oct 6 |
| Clermont 1 Nw, PA | 2,080 ft | May 15 | Oct 3 |
| Bradford Rgnl Ap, PA | 2,117 ft | May 18 | Oct 1 |
| Glen Hazel 2 Ne Dam, PA | 1,720 ft | May 14 | Oct 6 |
Frost dates near Crosby
- East Smethport, PA 16730 · last May 15, first Oct 6
- Smethport, PA 16749 · last May 18, first Oct 4
- Port Allegany, PA 16743 · last May 15, first Oct 6
- Turtlepoint, PA 16750 · last May 15, first Oct 6
- Hazel Hurst, PA 16733 · last May 14, first Oct 6
- Cyclone, PA 16726 · last May 18, first Oct 1
- Roulette, PA 16746 · last May 22, first Oct 1
- Gifford, PA 16732 · last May 18, first Oct 1
Frequently asked questions
- When is the last frost in Crosby, PA?
- For ZIP code 16724, the average last spring frost (32°F) is May 15, based on NOAA 1991-2020 climate normals for the Port Allegany, PA weather station. There is a 1-in-10 chance of a frost after May 29.
- When is the first frost in Crosby, PA?
- The average first fall frost (32°F) is October 6. There is a 1-in-10 chance of frost by September 25, so tender plants are at risk from that point on.
- How long is the growing season in 16724?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 144 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.