Los Alamos 13 W, NM Frost Dates & Growing Season

The two dates every Los Alamos 13 W garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Jun 10
~50% chance of frost after
First fall frost
Sep 13
~50% chance of frost before
Growing season
95 days
frost-free stretch
USDA zone
≈ 6b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 30 Jun 10 Jun 24
First fall frost Sep 25 Sep 13 Sep 1
Hard freeze (28°F), median last May 29 · first Sep 23

Computed from NOAA 1991–2020 climate normals at the LOS ALAMOS 13 W 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 Los Alamos 13 W

Computed from Los Alamos 13 W's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Apr 15 – Apr 29 Jun 17 – Jun 24
🫑 Peppers Apr 1 – Apr 15 Jun 24 – Jul 1
🥬 Lettuce Apr 29 – May 13 May 13 – May 27 May 13 – Jun 10
🫛 Peas Apr 29 – May 13
🥕 Carrots May 20 – Jun 10
🥦 Broccoli Apr 22 – May 6 May 20 – Jun 3
🥬 Kale Apr 29 – May 13 May 13 – May 27 May 13 – May 27
🥒 Cucumbers May 13 – May 20 Jun 17 – Jun 24 Jun 17 – Jun 24
🥒 Zucchini May 13 – May 20 Jun 17 – Jun 24 Jun 17 – Jun 24
🫘 Green Beans (Bush) Jun 17 – Jun 24
🌽 Sweet Corn Jun 17 – Jun 24
🌿 Basil Apr 29 – May 13 Jun 17 – Jun 24 Jun 24 – Jul 1
🧄 Garlic Fall: Aug 2 – Aug 30

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 Los Alamos 13 W's dates automatically after a lookup.

Reading the season in Los Alamos 13 W

At about 95 frost-free days, Los Alamos 13 W rewards efficiency: start warm-season crops indoors, favor short-season varieties, and lean on cold-tolerant crops — peas, kale, roots — that shrug off the shoulder-season frosts on either end.

Frequently asked questions

When is the last frost in Los Alamos 13 W, NM?

The average last spring frost in Los Alamos 13 W is around Jun 10, 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 Los Alamos 13 W, NM?

The average first fall frost in Los Alamos 13 W arrives around Sep 13. 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 Los Alamos 13 W?

About 95 frost-free days on average, from Jun 10 to Sep 13. That favors short-season varieties and transplants for warm-season crops, with cool-season vegetables doing the heavy lifting in spring and fall.

What USDA zone is Los Alamos 13 W in?

USDA zone 6b 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.