Slidell Airport, LA Frost Dates & Growing Season

The two dates every Slidell Airport garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 3
~50% chance of frost after
First fall frost
Nov 21
~50% chance of frost before
Growing season
263 days
frost-free stretch
USDA zone
≈ 9a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Feb 4 Mar 3 Mar 26
First fall frost Dec 13 Nov 21 Nov 4
Hard freeze (28°F), median last Feb 14 · first Dec 6

Computed from NOAA 1991–2020 climate normals at the SLIDELL AP station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Slidell Airport

Computed from Slidell Airport's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Jan 6 – Jan 20 Mar 10 – Mar 17
🫑 Peppers Dec 23 – Jan 6 Mar 17 – Mar 24
🥬 Lettuce Jan 20 – Feb 3 Feb 3 – Feb 17 Feb 3 – Mar 3
🫛 Peas Jan 20 – Feb 3
🥕 Carrots Feb 10 – Mar 3
🥦 Broccoli Jan 13 – Jan 27 Feb 10 – Feb 24
🥬 Kale Jan 20 – Feb 3 Feb 3 – Feb 17 Feb 3 – Feb 17
🥒 Cucumbers Feb 3 – Feb 10 Mar 10 – Mar 17 Mar 10 – Mar 17
🥒 Zucchini Feb 3 – Feb 10 Mar 10 – Mar 17 Mar 10 – Mar 17
🫘 Green Beans (Bush) Mar 10 – Mar 17
🌽 Sweet Corn Mar 10 – Mar 17
🌿 Basil Jan 20 – Feb 3 Mar 10 – Mar 17 Mar 17 – Mar 24
🧄 Garlic Fall: Oct 10 – Nov 7

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Slidell Airport's dates automatically after a lookup.

Reading the season in Slidell Airport

With roughly 263 frost-free days, Slidell Airport gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 21 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Slidell Airport, LA?

The average last spring frost in Slidell Airport is around Mar 3, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Slidell Airport, LA?

The average first fall frost in Slidell Airport arrives around Nov 21. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Slidell Airport?

About 263 frost-free days on average, from Mar 3 to Nov 21. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Slidell Airport in?

USDA zone 9a on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.