When to plant in Greensburg, PA
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Greensburg, Pennsylvania — all computed from Greensburg's nearest NOAA weather station.
In zone 6b, Greensburg gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average first fall frost in Greensburg is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
MT PLEASANT · 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 Greensburg’s own odds, recorded at MT PLEASANT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 13 | Apr 28 | Sep 21 | Oct 3 | Oct 14 |
| 32°F | May 19 | May 1 | Apr 17 | Oct 3 | Oct 13 | Oct 26 |
| 28°F | May 8 | Apr 20 | Apr 6 | Oct 10 | Oct 24 | Nov 8 |
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 Greensburg, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
Greensburg planting FAQ
When is the last spring frost in Greensburg, PA?
Greensburg's average last spring frost falls near May 1 — 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 Greensburg, PA?
In Greensburg, the first 32°F freeze of fall lands around October 13 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Greensburg in?
Greensburg 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 Greensburg?
Greensburg has about 165 frost-free days — a moderate growing season — between the average last spring frost (May 1) and first fall frost (October 13).
When should I plant tomatoes in Greensburg?
For Greensburg, sow tomatoes indoors about March 6–March 20 and move the seedlings out around May 8, after the last spring frost.
Never miss a window in Greensburg
An email when it’s time to start seeds, transplant, and sow — timed to Greensburg’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Murrysville · 18 km
- Monroeville · 22 km
- McKeesport · 26 km
- Plum · 27 km
- West Mifflin · 31 km
- Wilkinsburg · 32 km
- Munhall · 32 km
- Lower Burrell · 34 km
Frost dates recorded at MT PLEASANT, 11 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 Greensburg, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00366042. Retrieved from https://blissgarden.com/pennsylvania/greensburg.