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

Planting zone for 63115 — Saint Louis, MO

ZIP code 63115 (Saint Louis, St. Louis (city)) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 1 and the first fall frost November 4.

Where ZIP 63115 is

Outlined: the ZIP code area · 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
Coldest night−17.8 to −15 °C
Last frostApr 1
First frostNov 4
2012 zone6b

Was 6b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Saint Louis, MO…

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 Saint Louis, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 1median — 50% chance of a later frost
Safe for tender plantsApril 18only 10% chance of frost after
First fall frostNovember 4median — 10% chance by Oct 24
Growing season218 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 22 and returns around November 15.

From the NOAA station St Louis Sci Center, MO — 4 miles away, elevation 515 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 63115

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 18 – Mar 4
SpinachSow outdoors · Feb 18 – Mar 11
Broccoli, cabbageStart indoors · Jan 21 – Feb 4
Broccoli, cabbageTransplant · Mar 11 – Mar 25
Onion setsPlant outdoors · Mar 4 – Mar 18
PotatoesPlant outdoors · Mar 11 – Mar 25
LettuceSow outdoors · Mar 4 – Mar 18
Carrots, beetsSow outdoors · Mar 11 – Mar 25
TomatoesStart indoors · Feb 4 – Feb 18
TomatoesTransplant · Apr 8 – Apr 22
Peppers, eggplantStart indoors · Jan 21 – Feb 4
Peppers, eggplantTransplant · Apr 15 – Apr 29
BeansSow outdoors · Apr 8 – Apr 22
Sweet cornSow outdoors · Apr 8 – Apr 22
Cucumbers, squashSow outdoors · Apr 8 – Apr 22
Fall lettuce, spinachSow outdoors · Sep 9 – Sep 23
GarlicPlant cloves · Oct 21 – Nov 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 1) and first fall frost (Nov 4) 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 63115 came on Mar 1 — 11 days earlier than the 1991–2020 average (Mar 12).

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 Saint Louis, MO.

Soil in Saint Louis, MO

The soil mapped at the center of ZIP 63115 is Vandeventer — silt loam, well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureSilt loama good balance for most vegetables
pH7.1neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Vandeventer-Harvester complex, 3 to 8 percent slopes.

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 63115; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Saint Louis, MO

Summer high90 °Faverage high, July
Winter low25 °Faverage low, January
Hot days47days a year at 90 °F or more
Freezing nights79nights a year at 32 °F or less
Growing degree days4,703base 50 °F — the season’s usable heat
Longest day14 h 52 mindaylight on June 21
Shortest day9 h 27 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation43.9 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 41 °F, low 25 °F 41°25° JanFebruary: average high 46 °F, low 28 °F 46°28° FebMarch: average high 56 °F, low 38 °F 56°38° MarApril: average high 68 °F, low 48 °F 68°48° AprMay: average high 77 °F, low 59 °F 77°59° MayJune: average high 86 °F, low 67 °F 86°67° JunJuly: average high 90 °F, low 72 °F 90°72° JulAugust: average high 89 °F, low 70 °F 89°70° AugSeptember: average high 82 °F, low 62 °F 82°62° SepOctober: average high 70 °F, low 50 °F 70°50° OctNovember: average high 56 °F, low 39 °F 56°39° NovDecember: average high 45 °F, low 30 °F 45°30° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.71 in precipitation 2.7 JanFebruary: 2.28 in precipitation 2.3 FebMarch: 3.61 in precipitation 3.6 MarApril: 4.83 in precipitation 4.8 AprMay: 4.90 in precipitation 4.9 MayJune: 4.74 in precipitation 4.7 JunJuly: 4.21 in precipitation 4.2 JulAugust: 3.75 in precipitation 3.8 AugSeptember: 3.41 in precipitation 3.4 SepOctober: 3.20 in precipitation 3.2 OctNovember: 3.69 in precipitation 3.7 NovDecember: 2.58 in precipitation 2.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: St Louis Sci Center, MO (4 mi away); precipitation: St Louis Sci Center, MO (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

631207a
Saint Louis, MO · 1 mi
631477a
Saint Louis, MO · 2 mi
631137a
Saint Louis, MO · 2 mi
631077a
Saint Louis, MO · 2 mi
631567a
Saint Louis, MO · 2 mi
631577a
Saint Louis, MO · 2 mi
631587a
Saint Louis, MO · 2 mi
631607a
Saint Louis, MO · 2 mi

All 66 ZIP codes in Saint Louis → · Missouri planting zones →

Questions about 63115

What planting zone is ZIP code 63115?

ZIP code 63115 (Saint Louis, MO) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Saint Louis, MO?

The median last spring frost (32 °F) near 63115 is April 1; after April 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, St Louis Sci Center station.

When is the first frost in Saint Louis, MO?

The median first fall frost near 63115 is November 4, giving a median frost-free growing season of 218 days.

When should I plant tomatoes in 63115?

Start tomato seeds indoors around Feb 4 – Feb 18 and set transplants outside around Apr 8 – Apr 22, one to three weeks after the median last frost.

How much rain and snow does 63115 get?

About 43.9 inches of precipitation a year (NOAA 1991–2020 normals, St Louis Sci Center station).

How hot do summers get in Saint Louis, MO?

The average high peaks at 90 °F in July, with about 47 days a year at 90 °F or more.

What kind of soil does 63115 have?

The USDA soil survey maps Vandeventer at the center of ZIP 63115: silt loam, well drained, pH about 7.1 (neutral).

Did spring come early in Saint Louis, MO in 2026?

Spring leaf-out near 63115 came on Mar 1 in 2026, 11 days earlier than the 1991–2020 average (Mar 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Saint Louis, MO?

Intermediate onions: the longest day near 63115 is 14 h 52 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 63115 change?

Yes. The 2012 USDA map put 63115 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.