When to plant in Keystone, FL
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Keystone, Florida — all computed from Keystone's nearest NOAA weather station.
Keystone's growing season is short at roughly -11 days, so succession planting is limited; lean on transplants over direct sowing for anything slow to mature. In zone 9b, frost is a minor factor for Keystone — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
TARPON SPGS SEWAGE PLT · 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 Keystone’s own odds, recorded at TARPON SPGS SEWAGE PLT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 1 | Jan 31 | Jan 1 | Dec 3 | Dec 31 | Jan 27 |
| 32°F | Feb 14 | Jan 20 | Dec 29 | Dec 16 | Jan 9 | Feb 4 |
| 28°F | Feb 5 | Jan 15 | Dec 29 | Dec 24 | Jan 13 | Feb 1 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in Keystone, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 25 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.
Keystone planting FAQ
When is the last spring frost in Keystone, FL?
Plan for the last spring frost in Keystone around January 20 (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 Keystone, FL?
The first fall frost in Keystone typically arrives around January 9 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Keystone in?
Keystone is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Keystone?
Keystone has about -11 frost-free days — a short growing season — between the average last spring frost (January 20) and first fall frost (January 9).
When should I plant tomatoes in Keystone?
For Keystone, sow tomatoes indoors about November 25–December 9 and move the seedlings out around January 27, after the last spring frost.
Never miss a window in Keystone
An email when it’s time to start seeds, transplant, and sow — timed to Keystone’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Trinity · 7 km
- Citrus Park · 8 km
- Westchase · 8 km
- East Lake · 8 km
- Northdale · 8 km
- Cheval · 9 km
- Oldsmar · 11 km
- Carrollwood · 12 km
Frost dates recorded at TARPON SPGS SEWAGE PLT, 15 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 Keystone, FL — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00088824. Retrieved from https://blissgarden.com/florida/keystone.