When to plant in Chalmette, LA
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Chalmette, Louisiana — all computed from Chalmette's nearest NOAA weather station.
With about 310 frost-free days, Chalmette supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. In zone 9b, frost is a minor factor for Chalmette — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
CHALMETTE · 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 Chalmette’s own odds, recorded at CHALMETTE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 17 | Feb 26 | Jan 30 | Nov 10 | Nov 29 | Dec 26 |
| 32°F | Mar 8 | Feb 10 | Jan 12 | Nov 21 | Dec 17 | Jan 14 |
| 28°F | Feb 21 | Jan 26 | Dec 31 | Dec 4 | Jan 2 | Jan 30 |
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 Chalmette, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Chalmette planting FAQ
When is the last spring frost in Chalmette, LA?
On average, the last spring frost in Chalmette is around February 10 (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 Chalmette, LA?
The first fall frost in Chalmette typically arrives around December 17 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Chalmette in?
Chalmette is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Chalmette?
Chalmette has about 310 frost-free days — a long growing season — between the average last spring frost (February 10) and first fall frost (December 17).
When should I plant tomatoes in Chalmette?
For Chalmette, sow tomatoes indoors about December 16–December 30 and move the seedlings out around February 17, after the last spring frost.
Never miss a window in Chalmette
An email when it’s time to start seeds, transplant, and sow — timed to Chalmette’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Terrytown · 8 km
- Gretna · 9 km
- Timberlane · 10 km
- Belle Chasse · 10 km
- Harvey · 11 km
- New Orleans · 13 km
- Marrero · 16 km
- Woodmere · 16 km
Frost dates recorded at CHALMETTE, 2 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 Chalmette, LA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00166130. Retrieved from https://blissgarden.com/louisiana/chalmette.