When to plant in Port St. John, FL
USDA Zone 10aPort St. John, Florida frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Port St. John's growing season is short at roughly -12 days, so succession planting is limited; lean on transplants over direct sowing for anything slow to mature. These dates come from a station roughly 17 km away, the closest with full normals; terrain around Port St. John (elevation, water, pavement) can move your real frost dates a few days either way. Zone 10a is warm enough that Port St. John can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average first fall frost in Port St. John is now 8 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
TITUSVILLE · 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 Port St. John’s own odds, recorded at TITUSVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 7 | Feb 3 | Jan 5 | Dec 9 | Jan 5 | Feb 4 |
| 32°F | Feb 24 | Jan 25 | Dec 31 | Dec 23 | Jan 13 | Feb 10 |
| 28°F | Feb 8 | Jan 22 | Dec 27 | Dec 25 | Jan 16 | Feb 7 |
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 Port St. John, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 29 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.
Port St. John planting FAQ
When is the last spring frost in Port St. John, FL?
Plan for the last spring frost in Port St. John around January 25 (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 Port St. John, FL?
In Port St. John, the first 32°F freeze of fall lands around January 13 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Port St. John in?
Port St. John is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Port St. John?
There are roughly -12 frost-free days in Port St. John (a short growing season), running from the average last frost around January 25 to the first fall frost near January 13.
When should I plant tomatoes in Port St. John?
In Port St. John, start tomato seeds indoors around November 30–December 14, then transplant seedlings outdoors around February 1 once the danger of frost has passed.
Never miss a window in Port St. John
An email when it’s time to start seeds, transplant, and sow — timed to Port St. John’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Titusville · 11 km
- Cocoa · 12 km
- Rockledge · 19 km
- Cape Canaveral · 22 km
- Merritt Island · 23 km
- Cocoa Beach · 24 km
- Viera East · 26 km
- Viera West · 27 km
Frost dates recorded at TITUSVILLE, 17 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 Port St. John, FL — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00088942. Retrieved from https://blissgarden.com/florida/port-st-john.