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

Planting zone for 65660 — Graff, MO

ZIP code 65660 (Graff, Wright 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 28.

Where ZIP 65660 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 28

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 Graff, 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 Graff, 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 28median — 10% chance by Oct 15

Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 5.

From the NOAA station Mtn Grove 2 N, MO — 12 miles away, elevation 1,467 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 65660

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 · Sep 2 – Sep 16

GarlicPlant cloves · Oct 14 – Nov 18

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 28) 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 65660 came on Feb 28 — 11 days earlier than the 1991–2020 average (Mar 11).

average
Mar 112026
Feb 28

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 Graff, MO

The soil mapped at the center of ZIP 65660 is Clarksville — very gravelly silt loam, somewhat excessively drained.

TextureVery gravelly silt loama good balance for most vegetables

pH4.2strongly acidic; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter1.25%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Clarksville very gravelly silt loam, 3 to 15 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 65660; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Graff, MO

Summer high87 °Faverage high, July

Winter low22 °Faverage low, January

Hot days27days a year at 90 °F or more

Freezing nights103nights a year at 32 °F or less

Growing degree days3,919base 50 °F — the season’s usable heat

Longest day14 h 44 mindaylight on June 21

Shortest day9 h 35 mindaylight on December 21

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

Precipitation50 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: Mtn Grove 2 N, MO (12 mi away); precipitation: Mountain Grove 13.0 Nnw, MO (6 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.

Mountain Grove, MO · 10 mi

Hartville, MO · 13 mi

655576b

Roby, MO · 15 mi

Missouri planting zones →

Questions about 65660

What planting zone is ZIP code 65660?

ZIP code 65660 (Graff, 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 Graff, MO?

The median last spring frost (32 °F) near 65660 is April 11; after April 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mtn Grove 2 N station.

When is the first frost in Graff, MO?

The median first fall frost near 65660 is October 28, giving a median frost-free growing season of 196 days.

When should I plant tomatoes in 65660?

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 65660 get?

About 50 inches of precipitation a year (NOAA 1991–2020 normals, Mountain Grove 13.0 Nnw station).

How hot do summers get in Graff, MO?

The average high peaks at 87 °F in July, with about 27 days a year at 90 °F or more.

What kind of soil does 65660 have?

The USDA soil survey maps Clarksville at the center of ZIP 65660: very gravelly silt loam, somewhat excessively drained, pH about 4.2 (strongly acidic).

Did spring come early in Graff, MO in 2026?

Spring leaf-out near 65660 came on Feb 28 in 2026, 11 days earlier than the 1991–2020 average (Mar 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Graff, MO?

Intermediate onions: the longest day near 65660 is 14 h 44 min, so day-neutral types bulb best; long-day varieties may not bulb fully.