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

Planting zone for 67737 — Grainfield, KS

ZIP code 67737 (Grainfield, Gove County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 24 and the first fall frost October 18.

Where ZIP 67737 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 24

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 Grainfield, KS…

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 Grainfield, KS

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 24median — 50% chance of a later frost

Safe for tender plantsMay 7only 10% chance of frost after

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

Growing season176 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around October 26.

From the NOAA station Quinter, KS — 14 miles away, elevation 2,671 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 67737

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 13 – Mar 27

SpinachSow outdoors · Mar 13 – Apr 3

Broccoli, cabbageStart indoors · Feb 13 – Feb 27

Broccoli, cabbageTransplant · Apr 3 – Apr 17

Onion setsPlant outdoors · Mar 27 – Apr 10

PotatoesPlant outdoors · Apr 3 – Apr 17

LettuceSow outdoors · Mar 27 – Apr 10

Carrots, beetsSow outdoors · Apr 3 – Apr 17

TomatoesStart indoors · Feb 27 – Mar 13

TomatoesTransplant · May 1 – May 15

Peppers, eggplantStart indoors · Feb 13 – Feb 27

Peppers, eggplantTransplant · May 8 – May 22

BeansSow outdoors · May 1 – May 15

Sweet cornSow outdoors · May 1 – May 15

Cucumbers, squashSow outdoors · May 1 – May 15

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 24) 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 67737 came on Feb 21 — 26 days earlier than the 1991–2020 average (Mar 19).

average
Mar 192026
Feb 21

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 6a in Kansas

425 plants native to the lower 48 states, recorded in Kansas, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. 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 Grainfield, KS.

Soil in Grainfield, KS

The soil mapped at the center of ZIP 67737 is Ulysses — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH7.5slightly alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.9%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Ulysses silt loam, 3 to 6 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 67737; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Grainfield, KS

Summer high90 °Faverage high, July

Winter low17 °Faverage low, January

Hot days56days a year at 90 °F or more

Freezing nights141nights a year at 32 °F or less

Growing degree days3,542base 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

Precipitation22.2 inper year, rain and melted snow

Snowfall20 inper year; 26 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: Quinter, KS (14 mi away); precipitation: Grainfield, KS (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

Kansas planting zones →

Questions about 67737

What planting zone is ZIP code 67737?

ZIP code 67737 (Grainfield, KS) 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 Grainfield, KS?

The median last spring frost (32 °F) near 67737 is April 24; after May 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Quinter station.

When is the first frost in Grainfield, KS?

The median first fall frost near 67737 is October 18, giving a median frost-free growing season of 176 days.

When should I plant tomatoes in 67737?

Start tomato seeds indoors around Feb 27 – Mar 13 and set transplants outside around May 1 – May 15, one to three weeks after the median last frost.

How much rain and snow does 67737 get?

About 22.2 inches of precipitation a year and 20 inches of snowfall (NOAA 1991–2020 normals, Grainfield station).

How hot do summers get in Grainfield, KS?

The average high peaks at 90 °F in July, with about 56 days a year at 90 °F or more.

What kind of soil does 67737 have?

The USDA soil survey maps Ulysses at the center of ZIP 67737: silt loam, well drained, pH about 7.5 (slightly alkaline).

Did spring come early in Grainfield, KS in 2026?

Spring leaf-out near 67737 came on Feb 21 in 2026, 26 days earlier than the 1991–2020 average (Mar 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Grainfield, KS?

Intermediate onions: the longest day near 67737 is 14 h 55 min, so day-neutral types bulb best; long-day varieties may not bulb fully.