Frost Dates for Saint Louis, MO 63129

Last spring frost April 10 · First fall frost October 22 · 195 frost-free days · USDA Zone 7a

Frost probability for 63129

Frost10%50%90%
Spring (last frost)April 26April 10March 28
Fall (first frost)October 7October 22November 6

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (17.2 km away); the 50% date is the median year.

Frost dates by ZIP code in Saint Louis, MO

ZIPLast spring frost (50%)First fall frost (50%)Zone
63129April 10October 227a
63123April 7October 297a
63116April 7October 297a
63122April 7October 297a
63136April 7October 297a
63119April 7October 297a
63114April 7October 297a
63125April 10October 227a
63146April 12October 177a
63128April 10October 227a
63130April 7October 297a
63118April 7October 297a
63109April 7October 297a
63121April 7October 297a
63139April 7October 297a
63108April 7October 297a
63141April 7October 297a
63137April 7October 297a
63104April 7October 297a
63105April 7October 297a
63111April 10October 227a
63135April 7October 297a
63138April 7October 297a
63112April 7October 297a
63131April 7October 297a
63110April 7October 297a
63126April 7October 297a
63115April 7October 297a
63132April 7October 297a
63134April 7October 297a
63124April 7October 297a
63113April 7October 297a
63144April 7October 297a
63117April 7October 297a
63143April 7October 297a
63107April 7October 297a
63103April 7October 297a
63147April 7October 297a
63120April 7October 297a
63106April 7October 297a
63133April 7October 297a
63127April 7October 297a
63101April 7October 297a
63102April 7October 297a
63140April 7October 297a
63155April 7October 297a

Month by month in Saint Louis

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 10). 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 10. 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 22). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 22. 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 195-day season

Frequently Asked Questions

What is the last frost date for Saint Louis, MO (ZIP 63129)?

The median last spring frost date for Saint Louis, MO (ZIP code 63129) is around April 10. 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 Saint Louis, MO?

The median first fall frost date for Saint Louis, MO is around October 22. 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 Saint Louis, MO?

The frost-free growing season in Saint Louis is about 195 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 Saint Louis, MO?

Based on frost date patterns, Saint Louis 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 Saint Louis, MO?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 10). For Saint Louis, that's roughly February 14 to February 28. Transplant outdoors 1–2 weeks after your last frost.

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