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

Planting zone for 63005 — Chesterfield, MO

ZIP code 63005 (Chesterfield, St. Louis County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 12 and the first fall frost October 23.

Where ZIP 63005 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 12
First frostOct 23
2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Chesterfield, 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 Chesterfield, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 12median — 50% chance of a later frost
Safe for tender plantsApril 27only 10% chance of frost after
First fall frostOctober 23median — 10% chance by Oct 11
Growing season193 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 3.

From the NOAA station St Louis Sprt Of S L Airport, MO — within 1 mile, elevation 463 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 63005

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 1 – Mar 15
SpinachSow outdoors · Mar 1 – Mar 22
Broccoli, cabbageStart indoors · Feb 1 – Feb 15
Broccoli, cabbageTransplant · Mar 22 – Apr 5
Onion setsPlant outdoors · Mar 15 – Mar 29
PotatoesPlant outdoors · Mar 22 – Apr 5
LettuceSow outdoors · Mar 15 – Mar 29
Carrots, beetsSow outdoors · Mar 22 – Apr 5
TomatoesStart indoors · Feb 15 – Mar 1
TomatoesTransplant · Apr 19 – May 3
Peppers, eggplantStart indoors · Feb 1 – Feb 15
Peppers, eggplantTransplant · Apr 26 – May 10
BeansSow outdoors · Apr 19 – May 3
Sweet cornSow outdoors · Apr 19 – May 3
Cucumbers, squashSow outdoors · Apr 19 – May 3
Fall lettuce, spinachSow outdoors · Aug 28 – Sep 11
GarlicPlant cloves · Oct 9 – Nov 13
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 12) and first fall frost (Oct 23) 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 63005 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 6b in Missouri

525 plants native to the lower 48 states, recorded in Missouri, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 70

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 83

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 192

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 157

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 12

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °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 Chesterfield, MO.

Soil in Chesterfield, MO

The soil mapped at the center of ZIP 63005 is Menfro — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.5moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Menfro silt loam, 14 to 20 percent slopes, eroded.

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 63005; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Chesterfield, MO

Summer high90 °Faverage high, July
Winter low22 °Faverage low, January
Hot days44days a year at 90 °F or more
Freezing nights105nights a year at 32 °F or less
Growing degree days4,209base 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
Precipitation39.8 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 22 °F 41°22° JanFebruary: average high 47 °F, low 26 °F 47°26° FebMarch: average high 57 °F, low 34 °F 57°34° MarApril: average high 68 °F, low 44 °F 68°44° AprMay: average high 77 °F, low 55 °F 77°55° MayJune: average high 86 °F, low 64 °F 86°64° JunJuly: average high 90 °F, low 68 °F 90°68° JulAugust: average high 88 °F, low 66 °F 88°66° AugSeptember: average high 81 °F, low 57 °F 81°57° SepOctober: average high 70 °F, low 45 °F 70°45° OctNovember: average high 56 °F, low 34 °F 56°34° NovDecember: average high 45 °F, low 26 °F 45°26° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.38 in precipitation 2.4 JanFebruary: 1.98 in precipitation 2.0 FebMarch: 3.48 in precipitation 3.5 MarApril: 4.58 in precipitation 4.6 AprMay: 4.56 in precipitation 4.6 MayJune: 4.31 in precipitation 4.3 JunJuly: 3.30 in precipitation 3.3 JulAugust: 3.44 in precipitation 3.4 AugSeptember: 3.02 in precipitation 3.0 SepOctober: 3.10 in precipitation 3.1 OctNovember: 3.28 in precipitation 3.3 NovDecember: 2.32 in precipitation 2.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: St Louis Sprt Of S L Airport, MO (within 1 mile); precipitation: St Louis Sprt Of S L Airport, MO (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

7 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

630067a
Chesterfield, MO · 4 mi
633046b
Saint Charles, MO · 5 mi
630387a
Glencoe, MO · 5 mi
630407a
Grover, MO · 5 mi
630117a
Ballwin, MO · 6 mi
630177a
Chesterfield, MO · 6 mi
630227a
Ballwin, MO · 7 mi
630247a
Ballwin, MO · 7 mi

All 3 ZIP codes in Chesterfield → · Missouri planting zones →

Questions about 63005

What planting zone is ZIP code 63005?

ZIP code 63005 (Chesterfield, MO) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Chesterfield, MO?

The median last spring frost (32 °F) near 63005 is April 12; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, St Louis Sprt Of S L Airport station.

When is the first frost in Chesterfield, MO?

The median first fall frost near 63005 is October 23, giving a median frost-free growing season of 193 days.

When should I plant tomatoes in 63005?

Start tomato seeds indoors around Feb 15 – Mar 1 and set transplants outside around Apr 19 – May 3, one to three weeks after the median last frost.

How much rain and snow does 63005 get?

About 39.8 inches of precipitation a year (NOAA 1991–2020 normals, St Louis Sprt Of S L Airport station).

How hot do summers get in Chesterfield, MO?

The average high peaks at 90 °F in July, with about 44 days a year at 90 °F or more.

What kind of soil does 63005 have?

The USDA soil survey maps Menfro at the center of ZIP 63005: silt loam, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Chesterfield, MO in 2026?

Spring leaf-out near 63005 came on Mar 6 in 2026, 7 days earlier than the 1991–2020 average (Mar 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Chesterfield, MO?

Intermediate onions: the longest day near 63005 is 14 h 52 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 63005 change?

Yes. The 2012 USDA map put 63005 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.