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

Planting zone for 67123 — Potwin, KS

ZIP code 67123 (Potwin, Butler County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 13 and the first fall frost October 25.

Where ZIP 67123 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 13
First frostOct 25
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 Potwin, 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 Potwin, KS

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 13median — 50% chance of a later frost
Safe for tender plantsApril 27only 10% chance of frost after
First fall frostOctober 25median — 10% chance by Oct 11
Growing season193 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around November 2.

From the NOAA station El Dorado, KS — 12 miles away, elevation 1,289 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 67123

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 2 – Mar 16
SpinachSow outdoors · Mar 2 – Mar 23
Broccoli, cabbageStart indoors · Feb 2 – Feb 16
Broccoli, cabbageTransplant · Mar 23 – Apr 6
Onion setsPlant outdoors · Mar 16 – Mar 30
PotatoesPlant outdoors · Mar 23 – Apr 6
LettuceSow outdoors · Mar 16 – Mar 30
Carrots, beetsSow outdoors · Mar 23 – Apr 6
TomatoesStart indoors · Feb 16 – Mar 2
TomatoesTransplant · Apr 20 – May 4
Peppers, eggplantStart indoors · Feb 2 – Feb 16
Peppers, eggplantTransplant · Apr 27 – May 11
BeansSow outdoors · Apr 20 – May 4
Sweet cornSow outdoors · Apr 20 – May 4
Cucumbers, squashSow outdoors · Apr 20 – May 4
Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13
GarlicPlant cloves · Oct 11 – Nov 15
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 13) and first fall frost (Oct 25) 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 67123 came on Feb 23 — 18 days earlier than the 1991–2020 average (Mar 13).

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 Potwin, KS

The soil mapped at the center of ZIP 67123 is Irwin — silty clay loam, moderately well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH6.5neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter3%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classprime farmlandUSDA classification

Map unit: Irwin silty clay loam, 1 to 3 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 67123; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Potwin, KS

Summer high91 °Faverage high, July
Winter low20 °Faverage low, January
Hot days54days a year at 90 °F or more
Freezing nights112nights a year at 32 °F or less
Growing degree days4,347base 50 °F — the season’s usable heat
Longest day14 h 48 mindaylight on June 21
Shortest day9 h 32 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation36.8 inper year, rain and melted snow
Snowfall9 inper year; 6 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 44 °F, low 20 °F 44°20° JanFebruary: average high 49 °F, low 23 °F 49°23° FebMarch: average high 59 °F, low 33 °F 59°33° MarApril: average high 68 °F, low 43 °F 68°43° AprMay: average high 77 °F, low 55 °F 77°55° MayJune: average high 86 °F, low 64 °F 86°64° JunJuly: average high 91 °F, low 69 °F 91°69° JulAugust: average high 90 °F, low 67 °F 90°67° AugSeptember: average high 83 °F, low 58 °F 83°58° SepOctober: average high 71 °F, low 45 °F 71°45° OctNovember: average high 58 °F, low 33 °F 58°33° NovDecember: average high 46 °F, low 24 °F 46°24° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 0.75 in precipitation, 2.2 in snowfall 0.8❄2 JanFebruary: 1.27 in precipitation, 2.2 in snowfall 1.3❄2 FebMarch: 2.34 in precipitation, 1.1 in snowfall 2.3❄1 MarApril: 3.43 in precipitation, 0.3 in snowfall 3.4 AprMay: 5.50 in precipitation 5.5 MayJune: 5.35 in precipitation 5.3 JunJuly: 4.58 in precipitation 4.6 JulAugust: 4.42 in precipitation 4.4 AugSeptember: 3.30 in precipitation 3.3 SepOctober: 2.90 in precipitation, 0.1 in snowfall 2.9 OctNovember: 1.73 in precipitation, 0.5 in snowfall 1.7❄1 NovDecember: 1.23 in precipitation, 2.7 in snowfall 1.2❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: El Dorado, KS (12 mi away); precipitation: Potwin, KS (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

671546b
Whitewater, KS · 7 mi
671447a
Towanda, KS · 9 mi
670177a
Benton, KS · 10 mi
668406b
Burns, KS · 11 mi
670426b
El Dorado, KS · 13 mi
672287a
Wichita, KS · 15 mi
670557a
Greenwich, KS · 16 mi
668666b
Peabody, KS · 17 mi

Kansas planting zones →

Questions about 67123

What planting zone is ZIP code 67123?

ZIP code 67123 (Potwin, KS) 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 Potwin, KS?

The median last spring frost (32 °F) near 67123 is April 13; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, El Dorado station.

When is the first frost in Potwin, KS?

The median first fall frost near 67123 is October 25, giving a median frost-free growing season of 193 days.

When should I plant tomatoes in 67123?

Start tomato seeds indoors around Feb 16 – Mar 2 and set transplants outside around Apr 20 – May 4, one to three weeks after the median last frost.

How much rain and snow does 67123 get?

About 36.8 inches of precipitation a year and 9 inches of snowfall (NOAA 1991–2020 normals, Potwin station).

How hot do summers get in Potwin, KS?

The average high peaks at 91 °F in July, with about 54 days a year at 90 °F or more.

What kind of soil does 67123 have?

The USDA soil survey maps Irwin at the center of ZIP 67123: silty clay loam, moderately well drained, pH about 6.5 (neutral).

Did spring come early in Potwin, KS in 2026?

Spring leaf-out near 67123 came on Feb 23 in 2026, 18 days earlier than the 1991–2020 average (Mar 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Potwin, KS?

Intermediate onions: the longest day near 67123 is 14 h 48 min, so day-neutral types bulb best; long-day varieties may not bulb fully.