Munhall, PA planting zone & frost dates
Munhall is in USDA hardiness zone 6b. The last spring frost usually comes around April 5 and the first fall frost around November 10, for a growing season of about 219 days.
Planting calendar for Munhall
Dates are counted from the average last spring frost (April 5) 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 8 – Feb 22 Transplant outdoors: Apr 12 – Apr 19 |
| Peppers | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Apr 19 – Apr 26 |
| Eggplant | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Apr 19 – Apr 26 |
| Broccoli | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Mar 8 – Mar 22 |
| Cabbage | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Mar 8 – Mar 22 |
| Onions (sets) | Plant outdoors: Mar 8 – Mar 22 |
| Peas | Sow outdoors: Feb 22 – Mar 8 |
| Spinach | Sow outdoors: Feb 22 – Mar 8 |
| Lettuce | Sow outdoors: Mar 8 – Mar 22 |
| Carrots | Sow outdoors: Mar 8 – Mar 22 |
| Potatoes | Plant outdoors: Mar 8 – Mar 22 |
| Beans | Sow outdoors: Apr 12 – Apr 19 |
| Sweet corn | Sow outdoors: Apr 12 – Apr 19 |
| Cucumbers | Sow outdoors: Apr 12 – Apr 19 |
| Squash & zucchini | Sow outdoors: Apr 12 – Apr 19 |
| Basil | Start seeds indoors: Feb 22 – Mar 8 Transplant outdoors: Apr 12 – Apr 19 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 15 (8 weeks before the average first fall frost on Nov 10).
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 22 | Apr 5 | Apr 22 |
| First 32°F frost in fall is before | Nov 27 | Nov 10 | Oct 28 |
How to read it: in spring there is a 10% chance of a frost after April 22, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 28. A hard freeze (28°F) usually ends around March 27.
Nearby cities
- West Mifflin zone 6b, last frost May 2
- Wilkinsburg zone 6b, last frost Apr 5
- McKeesport zone 6b, last frost May 2
- North Versailles zone 6b, last frost Apr 5
- Baldwin zone 6b, last frost Apr 18
- Whitehall zone 6b, last frost Apr 18
- Jefferson Hills zone 6b, last frost Apr 18
- Pittsburgh zone 6b, last frost Apr 24
Questions
What growing zone is Munhall, PA?
Munhall 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 Munhall?
The average last spring frost (32°F) in Munhall is April 5. There is still a 10% chance of frost until April 22.
When can I plant tomatoes in Munhall?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 12 – Apr 19. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Braddock Lock 2, PA (USC00360861), 3.4 km (2.1 mi) from the city center, elevation 222 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.