When to plant in Johnstown, PA
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Johnstown, Pennsylvania — all computed from Johnstown's nearest NOAA weather station.
Zone 6b means Johnstown 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 Johnstown is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
JOHNSTOWN CAMBRIA CO AP · 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 Johnstown’s own odds, recorded at JOHNSTOWN CAMBRIA CO AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 8 | Apr 22 | Sep 24 | Oct 8 | Oct 23 |
| 32°F | May 17 | Apr 29 | Apr 14 | Oct 5 | Oct 21 | Nov 5 |
| 28°F | May 5 | Apr 17 | Apr 1 | Oct 19 | Nov 2 | Nov 16 |
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 Johnstown, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Johnstown planting FAQ
When is the last spring frost in Johnstown, PA?
Plan for the last spring frost in Johnstown around April 29 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Johnstown, PA?
The first fall frost in Johnstown typically arrives around October 21 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Johnstown in?
Johnstown 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 Johnstown?
There are roughly 175 frost-free days in Johnstown (a moderate growing season), running from the average last frost around April 29 to the first fall frost near October 21.
When should I plant tomatoes in Johnstown?
In Johnstown, start tomato seeds indoors around March 4–March 18, then transplant seedlings outdoors around May 6 once the danger of frost has passed.
Never miss a window in Johnstown
An email when it’s time to start seeds, transplant, and sow — timed to Johnstown’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Indiana · 38 km
- Altoona · 48 km
- Greensburg · 53 km
- Murrysville · 64 km
- Monroeville · 72 km
- Plum · 73 km
- Lower Burrell · 73 km
- New Kensington · 76 km
Frost dates recorded at JOHNSTOWN CAMBRIA CO AP, 7 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 Johnstown, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00004726. Retrieved from https://blissgarden.com/pennsylvania/johnstown.