Frost Dates for Port Saint Lucie, FL 34984

Port Saint Lucie has 6 ZIP codes. The Port Saint Lucie, FL frost page lists all of them with their dates.

Last spring frost January 19 · First fall frost January 29 · 10 frost-free days · USDA Zone 10a

Frost probability for 34984

Frost10%50%90%
Spring (last frost)February 23January 19—
Fall (first frost)December 20January 29—

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (21.6 km away); the 50% date is the median year.

Month by month in Port Saint Lucie

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 10-day season

Frequently Asked Questions

What is the last frost date for Port Saint Lucie, FL (ZIP 34984)?

The median last spring frost date for Port Saint Lucie, FL (ZIP code 34984) is around January 19. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Port Saint Lucie, FL?

The median first fall frost date for Port Saint Lucie, FL is around January 29. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Port Saint Lucie, FL?

The frost-free growing season in Port Saint Lucie is about 10 days. 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 Port Saint Lucie, FL?

Based on frost date patterns, Port Saint Lucie 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 Port Saint Lucie, FL?

Start tomato seeds indoors 6–8 weeks before your last frost date (around January 19). For Port Saint Lucie, that's roughly November 24 to December 8. Transplant outdoors 1–2 weeks after your last frost.

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