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

Planting zone for 66959 — Munden, KS

ZIP code 66959 (Munden, Republic County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 22 and the first fall frost October 17.

Where ZIP 66959 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 22
First frostOct 17
2012 zone5b

Was 5b on the 2012 map — half a zone warmer now. 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 Munden, 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 Munden, KS

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 22median — 50% chance of a later frost
Safe for tender plantsMay 5only 10% chance of frost after
First fall frostOctober 17median — 10% chance by Sep 30
Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 12 and returns around October 26.

From the NOAA station Belleville, KS — 9 miles away, elevation 1,529 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 66959

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 11 – Mar 25
SpinachSow outdoors · Mar 11 – Apr 1
Broccoli, cabbageStart indoors · Feb 11 – Feb 25
Broccoli, cabbageTransplant · Apr 1 – Apr 15
Onion setsPlant outdoors · Mar 25 – Apr 8
PotatoesPlant outdoors · Apr 1 – Apr 15
LettuceSow outdoors · Mar 25 – Apr 8
Carrots, beetsSow outdoors · Apr 1 – Apr 15
TomatoesStart indoors · Feb 25 – Mar 11
TomatoesTransplant · Apr 29 – May 13
Peppers, eggplantStart indoors · Feb 11 – Feb 25
Peppers, eggplantTransplant · May 6 – May 20
BeansSow outdoors · Apr 29 – May 13
Sweet cornSow outdoors · Apr 29 – May 13
Cucumbers, squashSow outdoors · Apr 29 – May 13
Fall lettuce, spinachSow outdoors · Aug 22 – Sep 5
GarlicPlant cloves · Oct 3 – Nov 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 22) and first fall frost (Oct 17) 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 66959 came on Mar 8 — 16 days earlier than the 1991–2020 average (Mar 24).

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 Munden, KS

The soil mapped at the center of ZIP 66959 is Crete — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH5.7moderately acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Crete silt loam, 1 to 3 percent slopes, loess plains and breaks.

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 66959; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Munden, KS

Summer high90 °Faverage high, July
Winter low16 °Faverage low, January
Hot days49days a year at 90 °F or more
Freezing nights133nights a year at 32 °F or less
Growing degree days3,760base 50 °F — the season’s usable heat
Longest day15 h 00 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation29.4 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 38 °F, low 16 °F 38°16° JanFebruary: average high 42 °F, low 19 °F 42°19° FebMarch: average high 54 °F, low 29 °F 54°29° MarApril: average high 64 °F, low 39 °F 64°39° AprMay: average high 74 °F, low 51 °F 74°51° MayJune: average high 85 °F, low 62 °F 85°62° JunJuly: average high 90 °F, low 67 °F 90°67° JulAugust: average high 88 °F, low 64 °F 88°64° AugSeptember: average high 80 °F, low 55 °F 80°55° SepOctober: average high 67 °F, low 42 °F 67°42° OctNovember: average high 53 °F, low 29 °F 53°29° NovDecember: average high 40 °F, low 19 °F 40°19° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 0.67 in precipitation 0.7 JanFebruary: 0.87 in precipitation 0.9 FebMarch: 1.56 in precipitation 1.6 MarApril: 2.54 in precipitation 2.5 AprMay: 4.55 in precipitation 4.5 MayJune: 3.93 in precipitation 3.9 JunJuly: 4.26 in precipitation 4.3 JulAugust: 3.47 in precipitation 3.5 AugSeptember: 3.09 in precipitation 3.1 SepOctober: 2.20 in precipitation 2.2 OctNovember: 1.26 in precipitation 1.3 NovDecember: 1.02 in precipitation 1.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Belleville, KS (9 mi away); precipitation: Belleville 4.2 N, KS (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

669606a
Narka, KS · 6 mi
683276a
Chester, NE · 8 mi
683756a
Hubbell, NE · 8 mi
669356a
Belleville, KS · 9 mi
669406a
Cuba, KS · 9 mi
669556a
Mahaska, KS · 12 mi
684296a
Reynolds, NE · 13 mi
683256a
Byron, NE · 13 mi

Kansas planting zones →

Questions about 66959

What planting zone is ZIP code 66959?

ZIP code 66959 (Munden, 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 Munden, KS?

The median last spring frost (32 °F) near 66959 is April 22; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Belleville station.

When is the first frost in Munden, KS?

The median first fall frost near 66959 is October 17, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 66959?

Start tomato seeds indoors around Feb 25 – Mar 11 and set transplants outside around Apr 29 – May 13, one to three weeks after the median last frost.

How much rain and snow does 66959 get?

About 29.4 inches of precipitation a year (NOAA 1991–2020 normals, Belleville 4.2 N station).

How hot do summers get in Munden, KS?

The average high peaks at 90 °F in July, with about 49 days a year at 90 °F or more.

What kind of soil does 66959 have?

The USDA soil survey maps Crete at the center of ZIP 66959: silt loam, moderately well drained, pH about 5.7 (moderately acidic).

Did spring come early in Munden, KS in 2026?

Spring leaf-out near 66959 came on Mar 8 in 2026, 16 days earlier than the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Munden, KS?

Long-day onions: the longest day near 66959 is 15 h 00 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 66959 change?

Yes. The 2012 USDA map put 66959 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.