Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for Fenton, MO

Fenton, MO is in USDA zones 6b to 7a across its 2 ZIP codes. The median last spring frost is April 4 and the first fall frost October 29.

Fenton on the zone map

Outlined: its 1 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.

Zones6b–7a−5 to 5 °F

ZIP codes2

Last frostApr 4

First frostOct 29

Growing season206 days

6b 1 ZIP 7a 1 ZIP

Frost forecast — next 7 nights

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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 Fenton, 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 Fenton

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 63099 came on Mar 3 — 9 days earlier than the 1991–2020 average (Mar 12).

average
Mar 122026
Mar 3

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.

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 Fenton, MO.

Soil in Fenton, MO

The soil mapped at the center of ZIP 63099 is Winfield — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH6.6neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter2.6%moderate

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Winfield-Urban land complex, 2 to 5 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 63099; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Fenton, 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

Precipitation44.9 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: St Charles 7 Ssw, MO (6 mi away); precipitation: Manchester 1.4 Se, MO (6 mi away). Daylight is calculated from latitude.

ZIP codes in Fenton

Missouri planting zones →

Questions about Fenton

What planting zone is Fenton, MO?

Fenton, MO is in USDA hardiness zones 6b to 7a on the 2023 map (6b: −5 to 0 °F; 7a: 0 to 5 °F).

When is the last frost in Fenton, 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 Fenton, 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 Fenton, 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 Fenton, MO get?

About 44.9 inches of precipitation a year (NOAA 1991–2020 normals).