Saint Louis, MO — USDA Zone 7a

Frost dates and growing season in Saint Louis

Saint Louis spans USDA zones 6 to 7 across its ZIP codes (Zone 6b, Zone 7a); the city center sits in Zone 7a, so warmer and cooler pockets exist either side of that.

These are 50%-probability averages modeled from Saint Louis's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by April 11, but a colder-than-average year can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.

Growing season in Saint Louis

Saint Louis, Missouri sits in USDA Zone 7a, with roughly 194 frost-free days between an average last spring frost around April 11 and a first fall frost around October 22. That is a long season — succession-sow through summer and run a full fall crop; heat-sensitive greens still need spring/autumn timing. Saint Louis lies near 38.6°N; higher-latitude gardens get longer midsummer days but a tighter shoulder season at this zone.

What grows in Saint Louis

Saint Louis falls in USDA Zone 7a, so the same hardiness constraints apply as the full Zone 7 guide. Vegetables, herbs, and fruit trees rated to Zone 7a (or hardier) will overwinter here in a typical year.

• Tomatoes, peppers, eggplant
• Okra
• Sweet potatoes
• Squash, melons
• Beans (lima + pole)
• Figs
• Pomegranates (in protected spots)
• Apples, peaches, plums, pears
• Blueberries (rabbiteye + highbush)
• Asparagus, rhubarb

What to plant in Saint Louis this week

Saint Louis is in high summer — most spring plantings are in. Keep an eye on watering and start planning your fall crop. Cool-season seedlings (broccoli, cabbage, lettuce) can be started indoors for a fall transplant.

• When to plant tomatoes in zone 7
• When to plant peppers in zone 7
• When to plant bush beans in zone 7
• When to plant cucumbers in zone 7
• When to plant basil in zone 7

Full planting calendar for Saint Louis

Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 7 averages:

• When to plant tomatoes in zone 7
• When to plant peppers in zone 7
• When to plant basil in zone 7
• When to plant garlic in zone 7
• When to plant lettuce in zone 7
• When to plant bush beans in zone 7
• When to plant cucumbers in zone 7
• When to plant summer squash in zone 7
• When to plant peas in zone 7
• When to plant carrots in zone 7
• When to plant broccoli in zone 7
• When to plant cauliflower in zone 7
• When to plant cabbage in zone 7
• When to plant kale in zone 7
• When to plant brussels sprouts in zone 7
• When to plant collard greens in zone 7
• When to plant spinach in zone 7
• When to plant swiss chard in zone 7
• When to plant arugula in zone 7
• When to plant beets in zone 7
• When to plant radishes in zone 7
• When to plant turnips in zone 7
• When to plant parsnips in zone 7
• When to plant kohlrabi in zone 7
• When to plant onions in zone 7
• When to plant leeks in zone 7
• When to plant celery in zone 7
• When to plant asparagus in zone 7
• When to plant rhubarb in zone 7
• When to plant potatoes in zone 7
• When to plant sweet potatoes in zone 7
• When to plant eggplant in zone 7
• When to plant okra in zone 7
• When to plant sweet corn in zone 7
• When to plant pumpkins in zone 7
• When to plant winter squash in zone 7
• When to plant zucchini in zone 7
• When to plant cantaloupe in zone 7
• When to plant watermelon in zone 7
• When to plant pole beans in zone 7
• When to plant edamame in zone 7
• When to plant fava beans in zone 7
• When to plant cilantro in zone 7
• When to plant dill in zone 7
• When to plant parsley in zone 7
• When to plant oregano in zone 7
• When to plant thyme in zone 7
• When to plant sage in zone 7
• When to plant rosemary in zone 7
• When to plant chives in zone 7

ZIP codes in Saint Louis

Drill down to the precise frost window and planting calendar for a specific ZIP in Saint Louis:

• 63101 — Saint Louis (Zone 7a)
• 63116 — Saint Louis (South) (Zone 7a)
• 63118 — Saint Louis (Benton Park) (Zone 7a)
• 63136 — Saint Louis (North County) (Zone 6b)

Local microclimate notes

Zone tables give you the average — but Saint Louis gardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record — the last time you actually got frost damage — beats any national average.

Source and methodology

Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from Saint Louis's USDA hardiness zone and regional NOAA 1991-2020 climate normals — zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations draw on US Cooperative Extension references, curated by the Growli editorial team. Last reviewed June 2026.

Other cities in Missouri

• Columbia, MO — USDA Zone 6b
• Jefferson City, MO — USDA Zone 6b
• Joplin, MO — USDA Zone 7a
• Kansas City, MO — USDA Zone 6b
• Lake Saint Louis, MO — USDA Zone 6b
• Saint Charles, MO — USDA Zone 6b
• Saint Joseph, MO — USDA Zone 6a
• Springfield, MO — USDA Zone 7a
• All of Missouri by zone

Related guides

• USDA Zone 7 — full plant + frost guide
• Browse USDA hardiness zones by city
• Look up a ZIP code
• How to start a vegetable garden — beginner guide