When to plant in Slidell, LA
USDA Zone 9aEverything below — frost dates, hardiness zone, and what to plant when in Slidell, Louisiana — is derived from the closest NOAA station with complete climate normals.
A generous ~280-day season lets Slidell gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 9a, frost is a minor factor for Slidell — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
SLIDELL · 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 Slidell’s own odds, recorded at SLIDELL.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 2 | Mar 12 | Feb 18 | Nov 1 | Nov 16 | Dec 7 |
| 32°F | Mar 19 | Feb 24 | Jan 29 | Nov 9 | Dec 1 | Jan 3 |
| 28°F | Mar 6 | Feb 4 | Jan 4 | Nov 26 | Dec 26 | Jan 26 |
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 Slidell, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Slidell planting FAQ
When is the last spring frost in Slidell, LA?
On average, the last spring frost in Slidell is around February 24 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Slidell, LA?
Expect Slidell's first fall frost near December 1 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Slidell in?
Slidell is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Slidell?
Slidell has about 280 frost-free days — a long growing season — between the average last spring frost (February 24) and first fall frost (December 1).
When should I plant tomatoes in Slidell?
For Slidell, sow tomatoes indoors about December 30–January 13 and move the seedlings out around March 3, after the last spring frost.
Never miss a window in Slidell
An email when it’s time to start seeds, transplant, and sow — timed to Slidell’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Picayune · 29 km
- New Orleans · 30 km
- Mandeville · 32 km
- Covington · 38 km
- Bay St. Louis · 41 km
- Chalmette · 42 km
- Terrytown · 49 km
- Gretna · 49 km
Frost dates recorded at SLIDELL, 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 Slidell, LA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00168539. Retrieved from https://blissgarden.com/louisiana/slidell.