Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for Ballwin, MO

Ballwin, MO is in USDA zone 7a across its 4 ZIP codes. The median last spring frost is April 4 and the first fall frost October 29.

Ballwin on the zone map

Outlined: its 2 ZIP code areas · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone7a0 to 5 °F
ZIP codes4
Last frostApr 4
First frostOct 29
Growing season206 days

7a 4 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Ballwin, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 4median — 50% chance of a later frost
Safe for tender plantsApril 21only 10% chance of frost after
First fall frostOctober 29median — 10% chance by Oct 15
Growing season206 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 25 and returns around November 8.

From the NOAA station St Charles 7 Ssw, MO, elevation 449 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in Ballwin

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 21 – Mar 7
SpinachSow outdoors · Feb 21 – Mar 14
Broccoli, cabbageStart indoors · Jan 24 – Feb 7
Broccoli, cabbageTransplant · Mar 14 – Mar 28
Onion setsPlant outdoors · Mar 7 – Mar 21
PotatoesPlant outdoors · Mar 14 – Mar 28
LettuceSow outdoors · Mar 7 – Mar 21
Carrots, beetsSow outdoors · Mar 14 – Mar 28
TomatoesStart indoors · Feb 7 – Feb 21
TomatoesTransplant · Apr 11 – Apr 25
Peppers, eggplantStart indoors · Jan 24 – Feb 7
Peppers, eggplantTransplant · Apr 18 – May 2
BeansSow outdoors · Apr 11 – Apr 25
Sweet cornSow outdoors · Apr 11 – Apr 25
Cucumbers, squashSow outdoors · Apr 11 – Apr 25
Fall lettuce, spinachSow outdoors · Sep 3 – Sep 17
GarlicPlant cloves · Oct 15 – Nov 19
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 4) and first fall frost (Oct 29) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 63022 came on Mar 6 — 7 days earlier than the 1991–2020 average (Mar 13).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 7a in Missouri

540 plants native to the lower 48 states, recorded in Missouri, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 72

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Fbald cypress130 ft · blooms mid spring · medium shade tolerance · to −18 °F

Shrubs 85

alternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 195

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 163

alkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fblister sedge3 ft · blooms late spring · medium shade tolerance · to −38 °F

Vines 14

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Ballwin, MO.

Soil in Ballwin, MO

The center of ZIP 63022 is mapped as Urban land, upland, 0 to 5 percent slopes: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 63022; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ballwin, MO

Summer high89 °Faverage high, July
Winter low22 °Faverage low, January
Hot days41days a year at 90 °F or more
Freezing nights106nights a year at 32 °F or less
Growing degree days4,318base 50 °F — the season’s usable heat
Longest day14 h 52 mindaylight on June 21
Shortest day9 h 28 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation44.6 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 22 °F 40°22° JanFebruary: average high 46 °F, low 25 °F 46°25° FebMarch: average high 56 °F, low 35 °F 56°35° MarApril: average high 67 °F, low 46 °F 67°46° AprMay: average high 77 °F, low 56 °F 77°56° MayJune: average high 85 °F, low 65 °F 85°65° JunJuly: average high 89 °F, low 69 °F 89°69° JulAugust: average high 88 °F, low 67 °F 88°67° AugSeptember: average high 81 °F, low 58 °F 81°58° SepOctober: average high 70 °F, low 46 °F 70°46° OctNovember: average high 56 °F, low 36 °F 56°36° NovDecember: average high 45 °F, low 27 °F 45°27° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 2.96 in precipitation 3.0 JanFebruary: 2.34 in precipitation 2.3 FebMarch: 3.66 in precipitation 3.7 MarApril: 4.68 in precipitation 4.7 AprMay: 5.07 in precipitation 5.1 MayJune: 4.81 in precipitation 4.8 JunJuly: 4.64 in precipitation 4.6 JulAugust: 3.35 in precipitation 3.4 AugSeptember: 3.72 in precipitation 3.7 SepOctober: 3.14 in precipitation 3.1 OctNovember: 3.69 in precipitation 3.7 NovDecember: 2.54 in precipitation 2.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: St Charles 7 Ssw, MO (6 mi away); precipitation: Ballwin 0.5 Nnw, MO (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Ballwin

630117a
0 to 5 °F
630217a
0 to 5 °F
630227a
0 to 5 °F
630247a
0 to 5 °F

Missouri planting zones →

Questions about Ballwin

What planting zone is Ballwin, MO?

Ballwin, MO is in USDA hardiness zone 7a on the 2023 map (7a: 0 to 5 °F).

When is the last frost in Ballwin, MO?

The median last spring frost is April 4 and the median first fall frost is October 29 (NOAA 1991–2020 normals, St Charles 7 Ssw station).

When can I plant a garden in Ballwin, MO?

Cool-season crops like peas and spinach go in around Feb 21 – Mar 14; tomatoes, peppers, beans and squash after about Apr 11, once frost risk has passed.

What kind of onions grow in Ballwin, MO?

Intermediate onions: the longest day is 14 h 52 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

How much rain and snow does Ballwin, MO get?

About 44.6 inches of precipitation a year (NOAA 1991–2020 normals).