Frost Dates for Florissant, MO 63031

Last spring frost April 7 · First fall frost October 29 · 205 frost-free days · USDA Zone 7a

Frost probability for 63031

Frost10%50%90%
Spring (last frost)April 26April 7March 26
Fall (first frost)October 13October 29November 12

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (7.1 km away); the 50% date is the median year.

Frost dates by ZIP code in Florissant, MO

ZIPLast spring frost (50%)First fall frost (50%)Zone
63031April 7October 297a
63033April 7October 297a
63034April 7October 297a

Month by month in Florissant

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around April 7). Start tomatoes about two weeks later, 6–8 weeks before last frost.
MarchStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
AprilLast frost around April 7. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
MayFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JuneSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JulyHarvest regularly to encourage production. Monitor for pests and disease.
AugustMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
SeptemberFirst fall frost approaching (around October 29). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 29. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
NovemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 205-day season

Frequently Asked Questions

What is the last frost date for Florissant, MO (ZIP 63031)?

The median last spring frost date for Florissant, MO (ZIP code 63031) is around April 7. 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 Florissant, MO?

The median first fall frost date for Florissant, MO is around October 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 Florissant, MO?

The frost-free growing season in Florissant is about 205 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 Florissant, MO?

Based on frost date patterns, Florissant falls approximately in 7a. 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 Florissant, MO?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 7). For Florissant, that's roughly February 11 to February 25. Transplant outdoors 1–2 weeks after your last frost.

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