Frost dates for 15411Addison, PA
The average last spring frost in Addison is May 19 and the average first fall frost is October 1, giving a typical growing season of about 135 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Oct 1
- Growing season
- 135 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 197 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 14 · May 31 · Jun 13 | Sep 7 · Sep 21 · Oct 3 | 113 days | 100% |
| Frost / freeze (32°F) | Apr 30 · May 19 · Jun 2 | Sep 18 · Oct 1 · Oct 13 | 135 days | 100% |
| Hard freeze (28°F) | Apr 20 · May 5 · May 22 | Sep 27 · Oct 10 · Oct 24 | 157 days | 100% |
Planting calendar for Addison
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 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 11 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 21 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 14 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 15411 is matched to the NOAA station Chalk Hill 2 Ene, PA, 23.7 km away, at 1,980 ft elevation (38 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chalk Hill 2 Ene, PA (used) | 1,980 ft | May 19 | Oct 1 |
| Confluence 1 Sw Dam, PA | 1,490 ft | Apr 30 | Oct 18 |
| Sines Deep Creek, MD | 2,040 ft | May 9 | Oct 11 |
| Meyersdale 2 Ssw, PA | 2,000 ft | May 12 | Oct 5 |
Frost dates near Addison
- Confluence, PA 15424 · last Apr 30, first Oct 18
- Ursina, PA 15485 · last Apr 30, first Oct 18
- Markleysburg, PA 15459 · last May 19, first Oct 1
- Fort Hill, PA 15540 · last May 12, first Oct 5
- Friendsville, MD 21531 · last Apr 30, first Oct 18
- Accident, MD 21520 · last May 6, first Oct 9
- Markleton, PA 15551 · last Apr 30, first Oct 18
- Springs, PA 15562 · last May 12, first Oct 5
Frequently asked questions
- When is the last frost in Addison, PA?
- For ZIP code 15411, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Chalk Hill 2 Ene, PA weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Addison, PA?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 15411?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 135 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.