Allison Park, PA planting zone & frost dates
Allison Park is in USDA hardiness zone 6b. The last spring frost usually comes around April 16 and the first fall frost around November 1, for a growing season of about 197 days.
Planting calendar for Allison Park
Dates are counted from the average last spring frost (April 16) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Feb 19 – Mar 5 Transplant outdoors: Apr 23 – Apr 30 |
| Peppers | Start seeds indoors: Feb 5 – Feb 19 Transplant outdoors: Apr 30 – May 7 |
| Eggplant | Start seeds indoors: Feb 5 – Feb 19 Transplant outdoors: Apr 30 – May 7 |
| Broccoli | Start seeds indoors: Feb 5 – Feb 19 Transplant outdoors: Mar 19 – Apr 2 |
| Cabbage | Start seeds indoors: Feb 5 – Feb 19 Transplant outdoors: Mar 19 – Apr 2 |
| Onions (sets) | Plant outdoors: Mar 19 – Apr 2 |
| Peas | Sow outdoors: Mar 5 – Mar 19 |
| Spinach | Sow outdoors: Mar 5 – Mar 19 |
| Lettuce | Sow outdoors: Mar 19 – Apr 2 |
| Carrots | Sow outdoors: Mar 19 – Apr 2 |
| Potatoes | Plant outdoors: Mar 19 – Apr 2 |
| Beans | Sow outdoors: Apr 23 – Apr 30 |
| Sweet corn | Sow outdoors: Apr 23 – Apr 30 |
| Cucumbers | Sow outdoors: Apr 23 – Apr 30 |
| Squash & zucchini | Sow outdoors: Apr 23 – Apr 30 |
| Basil | Start seeds indoors: Mar 5 – Mar 19 Transplant outdoors: Apr 23 – Apr 30 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 6 (8 weeks before the average first fall frost on Nov 1).
Useful for zone 6b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 31 | Apr 16 | May 4 |
| First 32°F frost in fall is before | Nov 13 | Nov 1 | Oct 18 |
How to read it: in spring there is a 10% chance of a frost after May 4, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 18. A hard freeze (28°F) usually ends around April 3.
Hardiness zone by ZIP code in Allison Park
- 15101 zone 6b
Nearby cities
- Pittsburgh zone 6b, last frost Apr 24
- Franklin Park zone 6b, last frost Apr 24
- Wilkinsburg zone 6b, last frost Apr 5
- Munhall zone 6b, last frost Apr 5
- New Kensington zone 6b, last frost Apr 16
- Cranberry Township zone 6b, last frost Apr 8
- Whitehall zone 6b, last frost Apr 18
- Lower Burrell zone 6b, last frost Apr 16
Questions
What growing zone is Allison Park, PA?
Allison Park is in USDA Plant Hardiness Zone 6b (average extreme winter low -5°F to 0°F), according to the USDA 2023 map.
When is the last frost in Allison Park?
The average last spring frost (32°F) in Allison Park is April 16. There is still a 10% chance of frost until May 4.
When can I plant tomatoes in Allison Park?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 23 – Apr 30. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Acmetonia Lock 3, PA (USC00360022), 12.4 km (7.7 mi) from the city center, elevation 228 m, based on 8 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.