Mandeville, LA planting zone & frost dates
Mandeville is in USDA hardiness zone 9a. The last spring frost usually comes around March 12 and the first fall frost around November 18, for a growing season of about 253 days.
Planting calendar for Mandeville
Dates are counted from the average last spring frost (March 12) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Jan 15 – Jan 29 Transplant outdoors: Mar 19 – Mar 26 |
| Peppers | Start seeds indoors: Jan 1 – Jan 15 Transplant outdoors: Mar 26 – Apr 2 |
| Eggplant | Start seeds indoors: Jan 1 – Jan 15 Transplant outdoors: Mar 26 – Apr 2 |
| Broccoli | Start seeds indoors: Jan 1 – Jan 15 Transplant outdoors: Feb 12 – Feb 26 |
| Cabbage | Start seeds indoors: Jan 1 – Jan 15 Transplant outdoors: Feb 12 – Feb 26 |
| Onions (sets) | Plant outdoors: Feb 12 – Feb 26 |
| Peas | Sow outdoors: Jan 29 – Feb 12 |
| Spinach | Sow outdoors: Jan 29 – Feb 12 |
| Lettuce | Sow outdoors: Feb 12 – Feb 26 |
| Carrots | Sow outdoors: Feb 12 – Feb 26 |
| Potatoes | Plant outdoors: Feb 12 – Feb 26 |
| Beans | Sow outdoors: Mar 19 – Mar 26 |
| Sweet corn | Sow outdoors: Mar 19 – Mar 26 |
| Cucumbers | Sow outdoors: Mar 19 – Mar 26 |
| Squash & zucchini | Sow outdoors: Mar 19 – Mar 26 |
| Basil | Start seeds indoors: Jan 29 – Feb 12 Transplant outdoors: Mar 19 – Mar 26 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 23 (8 weeks before the average first fall frost on Nov 18).
Useful for zone 9a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Shade cloth — for hot summers
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Feb 13 | Mar 12 | Apr 3 |
| First 32°F frost in fall is before | Dec 12 | Nov 18 | Nov 1 |
How to read it: in spring there is a 10% chance of a frost after April 3, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 1. A hard freeze (28°F) usually ends around February 19.
Hardiness zone by ZIP code in Mandeville
- 70448 zone 9a
- 70470 zone 9a
- 70471 zone 9a
Nearby cities
- Slidell zone 9a, last frost Feb 24
- Metairie zone 9b, last frost Jan 24
- Jefferson zone 9b, last frost Jan 24
- New Orleans zone 9b, last frost Feb 1
- Kenner zone 9b, last frost Jan 30
- Hammond zone 9a, last frost Mar 8
- River Ridge zone 9b, last frost Jan 30
- Chalmette zone 9b, last frost Feb 10
Questions
What growing zone is Mandeville, LA?
Mandeville is in USDA Plant Hardiness Zone 9a (average extreme winter low 20°F to 25°F), according to the USDA 2023 map.
When is the last frost in Mandeville?
The average last spring frost (32°F) in Mandeville is March 12. There is still a 10% chance of frost until April 3.
When can I plant tomatoes in Mandeville?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 19 – Mar 26. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Covington 4 Nnw, LA (USC00162151), 19.3 km (12.0 mi) from the city center, elevation 12 m, based on 19 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.