When to plant in McKeesport, PA
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in McKeesport, Pennsylvania — is derived from the closest NOAA station with complete climate normals.
Zone 6b means McKeesport sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average first fall frost in McKeesport is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
MCKEESPORT · 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 McKeesport’s own odds, recorded at MCKEESPORT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 27 | May 12 | Apr 26 | Sep 21 | Oct 7 | Oct 24 |
| 32°F | May 20 | May 2 | Apr 17 | Oct 1 | Oct 20 | Nov 3 |
| 28°F | May 10 | Apr 20 | Apr 2 | Oct 10 | Nov 1 | Nov 14 |
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 McKeesport, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 7 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.
McKeesport planting FAQ
When is the last spring frost in McKeesport, PA?
McKeesport's average last spring frost falls near May 2 — 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 McKeesport, PA?
In McKeesport, the first 32°F freeze of fall lands around October 20 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is McKeesport in?
McKeesport 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 McKeesport?
There are roughly 171 frost-free days in McKeesport (a moderate growing season), running from the average last frost around May 2 to the first fall frost near October 20.
When should I plant tomatoes in McKeesport?
In McKeesport, start tomato seeds indoors around March 7–March 21, then transplant seedlings outdoors around May 9 once the danger of frost has passed.
Never miss a window in McKeesport
An email when it’s time to start seeds, transplant, and sow — timed to McKeesport’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- West Mifflin · 5 km
- Munhall · 7 km
- Baldwin · 10 km
- Jefferson Hills · 10 km
- Wilkinsburg · 12 km
- Monroeville · 12 km
- Whitehall · 12 km
- Pittsburgh · 16 km
Frost dates recorded at MCKEESPORT, 1 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 McKeesport, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00365573. Retrieved from https://blissgarden.com/pennsylvania/mckeesport.