Frost Dates for Carlsbad, CA 92009

Last spring frost Frost-free zone · First fall frost Frost-free zone · 365 frost-free days · USDA Zone 10a

Frost probability for 92009

Frost10%50%90%
Spring (last frost)January 27——
Fall (first frost)December 16——

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (15.6 km away); the 50% date is the median year.

Frost dates by ZIP code in Carlsbad, CA

ZIPLast spring frost (50%)First fall frost (50%)Zone
92009——10a
92008——10a
92011——10b
92010——10a

Month by month in Carlsbad

MonthWhat to do
JanuaryPlant cool-season crops: lettuce, spinach, broccoli, peas, and carrots.
FebruaryDirect sow brassicas and root vegetables. Start warm-season seedlings indoors.
MarchTransplant warm-season crops outdoors. Sow beans, cucumbers, and squash.
AprilMain warm-season planting window. Direct sow melons and sweet corn.
MaySuccession plant lettuce. Keep beds irrigated as temperatures climb.
JuneMonitor for heat stress. Harvest zucchini and cucumbers frequently.
JulyHarvest regularly to encourage continued production. Watch for pests.
AugustStart fall cool-season crops: broccoli, kale, beets, and carrots.
SeptemberPlant fall lettuce, spinach, arugula, and radishes.
OctoberHarvest mature crops. Direct sow cold-tolerant greens.
NovemberPlant garlic and onion sets. Harvest cool-season crops through the month.
DecemberPlant cool-season crops for winter harvest. Plan next year's garden.

What grows in a 365-day season

Frequently Asked Questions

What is the last frost date for Carlsbad, CA (ZIP 92009)?

Carlsbad, CA is frost-free in most years, so there's no last spring frost date to plan around.

What is the first fall frost date in Carlsbad, CA?

Carlsbad, CA is frost-free in most years, so there's no first fall frost date to plan around.

How long is the growing season in Carlsbad, CA?

The frost-free growing season in Carlsbad is year-round. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Carlsbad, CA?

Based on frost date patterns, Carlsbad falls approximately in 10a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Carlsbad, CA?

Carlsbad is a frost-free zone, so you can start tomatoes and transplant at any time of year. Focus on heat management rather than frost timing.

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