When to plant in Middleburg, FL
USDA Zone 9aMiddleburg, Florida frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Middleburg enjoys a long ~319-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Middleburg's nearest full-normals station sits about 24 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. In zone 9a, frost is a minor factor for Middleburg — most perennials thrive, and annual vegetables can go out early and stay late.
The average first fall frost in Middleburg is now 23 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
STARKE · 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 Middleburg’s own odds, recorded at STARKE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 22 | Mar 1 | Feb 2 | Nov 9 | Dec 2 | Jan 1 |
| 32°F | Mar 8 | Feb 8 | Jan 6 | Nov 29 | Dec 24 | Jan 30 |
| 28°F | Feb 20 | Jan 23 | Dec 26 | Dec 7 | Jan 4 | Feb 9 |
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 Middleburg, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 33 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.
Middleburg planting FAQ
When is the last spring frost in Middleburg, FL?
Middleburg's average last spring frost falls near February 8 — 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 Middleburg, FL?
The first fall frost in Middleburg typically arrives around December 24 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Middleburg in?
Middleburg is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Middleburg?
Middleburg has about 319 frost-free days — a long growing season — between the average last spring frost (February 8) and first fall frost (December 24).
When should I plant tomatoes in Middleburg?
For Middleburg, sow tomatoes indoors about December 14–December 28 and move the seedlings out around February 15, after the last spring frost.
Never miss a window in Middleburg
An email when it’s time to start seeds, transplant, and sow — timed to Middleburg’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Asbury Lake · 11 km
- Oakleaf Plantation · 15 km
- Lakeside · 16 km
- Fleming Island · 19 km
- Bellair-Meadowbrook Terrace · 22 km
- Green Cove Springs · 22 km
- Fruit Cove · 27 km
- Jacksonville · 39 km
Frost dates recorded at STARKE, 24 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 Middleburg, FL — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00088529. Retrieved from https://blissgarden.com/florida/middleburg.