Carnot-Moon, PA planting zone & frost dates
Carnot-Moon is in USDA hardiness zone 6b. The last spring frost usually comes around April 28 and the first fall frost around October 18, for a growing season of about 172 days.
Planting calendar for Carnot-Moon
Dates are counted from the average last spring frost (April 28) 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: Mar 3 – Mar 17 Transplant outdoors: May 5 – May 12 |
| Peppers | Start seeds indoors: Feb 17 – Mar 3 Transplant outdoors: May 12 – May 19 |
| Eggplant | Start seeds indoors: Feb 17 – Mar 3 Transplant outdoors: May 12 – May 19 |
| Broccoli | Start seeds indoors: Feb 17 – Mar 3 Transplant outdoors: Mar 31 – Apr 14 |
| Cabbage | Start seeds indoors: Feb 17 – Mar 3 Transplant outdoors: Mar 31 – Apr 14 |
| Onions (sets) | Plant outdoors: Mar 31 – Apr 14 |
| Peas | Sow outdoors: Mar 17 – Mar 31 |
| Spinach | Sow outdoors: Mar 17 – Mar 31 |
| Lettuce | Sow outdoors: Mar 31 – Apr 14 |
| Carrots | Sow outdoors: Mar 31 – Apr 14 |
| Potatoes | Plant outdoors: Mar 31 – Apr 14 |
| Beans | Sow outdoors: May 5 – May 12 |
| Sweet corn | Sow outdoors: May 5 – May 12 |
| Cucumbers | Sow outdoors: May 5 – May 12 |
| Squash & zucchini | Sow outdoors: May 5 – May 12 |
| Basil | Start seeds indoors: Mar 17 – Mar 31 Transplant outdoors: May 5 – May 12 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 23 (8 weeks before the average first fall frost on Oct 18).
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 | Apr 15 | Apr 28 | May 15 |
| First 32°F frost in fall is before | Nov 4 | Oct 18 | Oct 5 |
How to read it: in spring there is a 10% chance of a frost after May 15, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 5. A hard freeze (28°F) usually ends around April 17.
Nearby cities
- Franklin Park zone 6b, last frost Apr 24
- Fernway zone 6b, last frost Apr 27
- Cranberry Township zone 6b, last frost Apr 8
- Upper Saint Clair zone 6b, last frost Apr 18
- Mount Lebanon zone 6b, last frost Apr 18
- Pittsburgh zone 6b, last frost Apr 24
- Bethel Park zone 6b, last frost Apr 18
- Allison Park zone 6b, last frost Apr 16
Questions
What growing zone is Carnot-Moon, PA?
Carnot-Moon 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 Carnot-Moon?
The average last spring frost (32°F) in Carnot-Moon is April 28. There is still a 10% chance of frost until May 15.
When can I plant tomatoes in Carnot-Moon?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 5 – May 12. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Moon Twp, PA (USC00365918), 1.5 km (0.9 mi) from the city center, elevation 357 m, based on 10 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.