When to plant in Monroeville, PA
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in Monroeville, Pennsylvania — is derived from the closest NOAA station with complete climate normals.
In zone 6b, Monroeville gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
MURRYSVILLE 2 SW · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Monroeville’s own odds, recorded at MURRYSVILLE 2 SW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 20 | May 5 | Apr 19 | Oct 1 | Oct 13 | Oct 26 |
| 32°F | May 12 | Apr 22 | Apr 7 | Oct 10 | Oct 25 | Nov 6 |
| 28°F | Apr 23 | Apr 7 | Mar 24 | Oct 23 | Nov 5 | Nov 20 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Monroeville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Monroeville planting FAQ
When is the last spring frost in Monroeville, PA?
Monroeville's average last spring frost falls near April 22 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Monroeville, PA?
In Monroeville, the first 32°F freeze of fall lands around October 25 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Monroeville in?
Monroeville is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Monroeville?
Monroeville has about 186 frost-free days — a moderate growing season — between the average last spring frost (April 22) and first fall frost (October 25).
When should I plant tomatoes in Monroeville?
For Monroeville, sow tomatoes indoors about February 25–March 11 and move the seedlings out around April 29, after the last spring frost.
Never miss a window in Monroeville
An email when it’s time to start seeds, transplant, and sow — timed to Monroeville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Plum · 8 km
- Murrysville · 9 km
- Wilkinsburg · 10 km
- McKeesport · 12 km
- Munhall · 12 km
- West Mifflin · 14 km
- New Kensington · 16 km
- Baldwin · 16 km
Frost dates recorded at MURRYSVILLE 2 SW, 4 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Monroeville, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00366111. Retrieved from https://blissgarden.com/pennsylvania/monroeville.