When to plant in Carlisle, PA
USDA Zone 7aCarlisle, Pennsylvania frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 7a means many perennials and even some tender shrubs overwinter in Carlisle, while your frost dates still decide when annuals go out.
Frost probability
CARLISLE WTP · 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 Carlisle’s own odds, recorded at CARLISLE WTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 19 | May 3 | Apr 20 | Sep 25 | Oct 6 | Oct 21 |
| 32°F | May 9 | Apr 23 | Apr 9 | Oct 4 | Oct 18 | Nov 2 |
| 28°F | Apr 24 | Apr 10 | Mar 28 | Oct 14 | 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 Carlisle, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 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.
Carlisle planting FAQ
When is the last spring frost in Carlisle, PA?
Plan for the last spring frost in Carlisle around April 23 (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 Carlisle, PA?
Expect Carlisle's first fall frost near October 18 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Carlisle in?
Carlisle is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Carlisle?
There are roughly 178 frost-free days in Carlisle (a moderate growing season), running from the average last frost around April 23 to the first fall frost near October 18.
When should I plant tomatoes in Carlisle?
In Carlisle, start tomato seeds indoors around February 26–March 12, then transplant seedlings outdoors around April 30 once the danger of frost has passed.
Never miss a window in Carlisle
An email when it’s time to start seeds, transplant, and sow — timed to Carlisle’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Harrisburg · 28 km
- Progress · 33 km
- Colonial Park · 35 km
- Weigelstown · 40 km
- Shiloh · 43 km
- Hanover · 47 km
- York · 48 km
- Hershey · 48 km
Frost dates recorded at CARLISLE WTP, 3 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 Carlisle, PA — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00361920. Retrieved from https://blissgarden.com/pennsylvania/carlisle.