When to plant in Mandeville, LA
USDA Zone 9aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Mandeville, Louisiana — all computed from Mandeville's nearest NOAA weather station.
With about 251 frost-free days, Mandeville supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. These dates come from a station roughly 17 km away, the closest with full normals; terrain around Mandeville (elevation, water, pavement) can move your real frost dates a few days either way. Zone 9a is warm enough that Mandeville can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Mandeville is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
COVINGTON 4 NNW · 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 Mandeville’s own odds, recorded at COVINGTON 4 NNW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 15 | Mar 27 | Mar 3 | Oct 24 | Nov 7 | Nov 25 |
| 32°F | Apr 3 | Mar 12 | Feb 13 | Nov 1 | Nov 18 | Dec 12 |
| 28°F | Mar 17 | Feb 19 | Jan 18 | Nov 12 | Dec 3 | Jan 6 |
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 Mandeville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 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.
Mandeville planting FAQ
When is the last spring frost in Mandeville, LA?
Plan for the last spring frost in Mandeville around March 12 (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 Mandeville, LA?
In Mandeville, the first 32°F freeze of fall lands around November 18 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Mandeville in?
Mandeville is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Mandeville?
There are roughly 251 frost-free days in Mandeville (a long growing season), running from the average last frost around March 12 to the first fall frost near November 18.
When should I plant tomatoes in Mandeville?
In Mandeville, start tomato seeds indoors around January 15–January 29, then transplant seedlings outdoors around March 19 once the danger of frost has passed.
Never miss a window in Mandeville
An email when it’s time to start seeds, transplant, and sow — timed to Mandeville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Covington · 12 km
- Slidell · 32 km
- Hammond · 37 km
- New Orleans · 39 km
- Metairie · 43 km
- Kenner · 43 km
- Picayune · 45 km
- River Ridge · 48 km
Frost dates recorded at COVINGTON 4 NNW, 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 Mandeville, LA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00162151. Retrieved from https://blissgarden.com/louisiana/mandeville.