Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for 65604 — Ash Grove, MO

ZIP code 65604 (Ash Grove, Greene County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 11 and the first fall frost October 24.

Where ZIP 65604 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 11

First frostOct 24

2012 zone6b

Same zone as on the 2012 map. 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 Ash Grove, 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 Ash Grove, MO

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 11median — 50% chance of a later frost

Safe for tender plantsApril 29only 10% chance of frost after

First fall frostOctober 24median — 10% chance by Oct 13

Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 2.

From the NOAA station Ash Grove 4s, MO — within 1 mile, elevation 1,129 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 65604

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 28 – Mar 14

SpinachSow outdoors · Feb 28 – Mar 21

Broccoli, cabbageStart indoors · Jan 31 – Feb 14

Broccoli, cabbageTransplant · Mar 21 – Apr 4

Onion setsPlant outdoors · Mar 14 – Mar 28

PotatoesPlant outdoors · Mar 21 – Apr 4

LettuceSow outdoors · Mar 14 – Mar 28

Carrots, beetsSow outdoors · Mar 21 – Apr 4

TomatoesStart indoors · Feb 14 – Feb 28

TomatoesTransplant · Apr 18 – May 2

Peppers, eggplantStart indoors · Jan 31 – Feb 14

Peppers, eggplantTransplant · Apr 25 – May 9

BeansSow outdoors · Apr 18 – May 2

Sweet cornSow outdoors · Apr 18 – May 2

Cucumbers, squashSow outdoors · Apr 18 – May 2

Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12

GarlicPlant cloves · Oct 10 – Nov 14

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 24) 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 65604 came on Feb 18 — 18 days earlier than the 1991–2020 average (Mar 8).

average
Mar 82026
Feb 18

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 Ash Grove, MO.

Soil in Ash Grove, MO

The soil mapped at the center of ZIP 65604 is Keeno — gravelly silt loam, moderately well drained.

TextureGravelly silt loama good balance for most vegetables

pH7.1neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter3.5%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Keeno gravelly silt loam, 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 65604; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ash Grove, MO

Summer high91 °Faverage high, July

Winter low24 °Faverage low, January

Hot days55days a year at 90 °F or more

Freezing nights104nights a year at 32 °F or less

Growing degree days4,402base 50 °F — the season’s usable heat

Longest day14 h 44 mindaylight on June 21

Shortest day9 h 36 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation43.5 inper year, rain and melted snow

Snowfall9 inper year; 4 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ash Grove 4s, MO (within 1 mile); precipitation: Ash Grove 4s, MO (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

656647a

Halltown, MO · 5 mi

656126b

Bois D Arc, MO · 5 mi

656466b

Everton, MO · 7 mi

657706b

Walnut Grove, MO · 11 mi

Marionville, MO · 12 mi

657077a

Miller, MO · 14 mi

Missouri planting zones →

Questions about 65604

What planting zone is ZIP code 65604?

ZIP code 65604 (Ash Grove, 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 Ash Grove, MO?

The median last spring frost (32 °F) near 65604 is April 11; after April 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ash Grove 4s station.

When is the first frost in Ash Grove, MO?

The median first fall frost near 65604 is October 24, giving a median frost-free growing season of 196 days.

When should I plant tomatoes in 65604?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 65604 get?

About 43.5 inches of precipitation a year and 9 inches of snowfall (NOAA 1991–2020 normals, Ash Grove 4s station).

How hot do summers get in Ash Grove, MO?

The average high peaks at 91 °F in July, with about 55 days a year at 90 °F or more.

What kind of soil does 65604 have?

The USDA soil survey maps Keeno at the center of ZIP 65604: gravelly silt loam, moderately well drained, pH about 7.1 (neutral).

Did spring come early in Ash Grove, MO in 2026?

Spring leaf-out near 65604 came on Feb 18 in 2026, 18 days earlier than the 1991–2020 average (Mar 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ash Grove, MO?

Intermediate onions: the longest day near 65604 is 14 h 44 min, so day-neutral types bulb best; long-day varieties may not bulb fully.