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

Planting zone for 64074 — Napoleon, MO

ZIP code 64074 (Napoleon, Lafayette County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 19 and the first fall frost October 18.

Where ZIP 64074 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.

Zone6a−10 to −5 °F

Coldest night−23.3 to −20.6 °C

Last frostApr 19

First frostOct 18

2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Napoleon, 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 Napoleon, MO

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 19median — 50% chance of a later frost

Safe for tender plantsMay 3only 10% chance of frost after

First fall frostOctober 18median — 10% chance by Oct 3

Growing season180 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 8 and returns around October 27.

From the NOAA station Richmond 3s, MO — 12 miles away, elevation 699 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 64074

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 8 – Mar 22

SpinachSow outdoors · Mar 8 – Mar 29

Broccoli, cabbageStart indoors · Feb 8 – Feb 22

Broccoli, cabbageTransplant · Mar 29 – Apr 12

Onion setsPlant outdoors · Mar 22 – Apr 5

PotatoesPlant outdoors · Mar 29 – Apr 12

LettuceSow outdoors · Mar 22 – Apr 5

Carrots, beetsSow outdoors · Mar 29 – Apr 12

TomatoesStart indoors · Feb 22 – Mar 8

TomatoesTransplant · Apr 26 – May 10

Peppers, eggplantStart indoors · Feb 8 – Feb 22

Peppers, eggplantTransplant · May 3 – May 17

BeansSow outdoors · Apr 26 – May 10

Sweet cornSow outdoors · Apr 26 – May 10

Cucumbers, squashSow outdoors · Apr 26 – May 10

Fall lettuce, spinachSow outdoors · Aug 23 – Sep 6

GarlicPlant cloves · Oct 4 – Nov 8

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 19) and first fall frost (Oct 18) 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 64074 came on Mar 4 — 14 days earlier than the 1991–2020 average (Mar 18).

average
Mar 182026
Mar 4

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).

Soil in Napoleon, MO

The soil mapped at the center of ZIP 64074 is Marshall — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH6.6neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3.8%moderate

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Marshall silt loam, 9 to 14 percent slopes, severely 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 64074; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Napoleon, MO

Summer high87 °Faverage high, July

Winter low15 °Faverage low, January

Hot days34days a year at 90 °F or more

Freezing nights131nights a year at 32 °F or less

Growing degree days3,584base 50 °F — the season’s usable heat

Longest day14 h 55 mindaylight on June 21

Shortest day9 h 25 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

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Richmond 3s, MO (12 mi away); precipitation: Blue Springs 0.9 Nw, MO (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

640976a

Wellington, MO · 5 mi

Bates City, MO · 9 mi

640296b

Grain Valley, MO · 9 mi

Missouri planting zones →

Questions about 64074

What planting zone is ZIP code 64074?

ZIP code 64074 (Napoleon, MO) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Napoleon, MO?

The median last spring frost (32 °F) near 64074 is April 19; after May 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Richmond 3s station.

When is the first frost in Napoleon, MO?

The median first fall frost near 64074 is October 18, giving a median frost-free growing season of 180 days.

When should I plant tomatoes in 64074?

Start tomato seeds indoors around Feb 22 – Mar 8 and set transplants outside around Apr 26 – May 10, one to three weeks after the median last frost.

How much rain and snow does 64074 get?

About 43.5 inches of precipitation a year (NOAA 1991–2020 normals, Blue Springs 0.9 Nw station).

How hot do summers get in Napoleon, MO?

The average high peaks at 87 °F in July, with about 34 days a year at 90 °F or more.

What kind of soil does 64074 have?

The USDA soil survey maps Marshall at the center of ZIP 64074: silt loam, well drained, pH about 6.6 (neutral).

Did spring come early in Napoleon, MO in 2026?

Spring leaf-out near 64074 came on Mar 4 in 2026, 14 days earlier than the 1991–2020 average (Mar 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Napoleon, MO?

Intermediate onions: the longest day near 64074 is 14 h 55 min, so day-neutral types bulb best; long-day varieties may not bulb fully.