Frost Dates for Monroeville, PA
In Monroeville, PA, the average last spring frost is around Apr 22 and the average first fall frost around Oct 25, for a growing season of about 186 days. For frost-tender plants, wait until May 12, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Murrysville 2 Sw, PA weather station, 2 miles away, elevation 860 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | May 12 | Oct 10 |
| 20% | May 5 | Oct 15 |
| 30% | Apr 29 | Oct 19 |
| 40% | Apr 25 | Oct 22 |
| 50% | Apr 22 | Oct 25 |
| 60% | Apr 20 | Oct 28 |
| 70% | Apr 17 | Oct 30 |
| 80% | Apr 12 | Nov 2 |
| 90% | Apr 7 | Nov 6 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | May 5 | Oct 13 |
| Frost / freeze (32°F) | Apr 22 | Oct 25 |
| Hard freeze (28°F) | Apr 7 | Nov 5 |
Planting calendar for Monroeville
Transplant Apr 29 – May 13
Transplant May 6 – May 20
Transplant May 6 – May 20
Transplant Apr 29 – May 13
Sow or transplant Apr 29 – May 13
Sow or transplant Apr 29 – May 13
Sow or transplant May 6 – May 20
Sow or transplant Mar 25 – Apr 8
Fall sowing Aug 30 – Sep 27
Fall sowing Aug 30 – Sep 20
Fall sowing Aug 16 – Aug 30
Sow or transplant Mar 25 – Apr 8
Fall sowing Aug 16 – Sep 13
Transplant Apr 8 – Apr 22
Fall sowing Aug 2 – Aug 16
Transplant Apr 1 – Apr 15
Fall sowing Aug 2 – Aug 16
Fall sowing Aug 2 – Aug 16
Fall sowing Sep 13 – Oct 4
Fall sowing Aug 16 – Aug 30
Plant Mar 25 – Apr 8
Based on the average last frost (Apr 22) and first frost (Oct 25). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.