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

Planting zone for 67474 — Portis, KS

ZIP code 67474 (Portis, Osborne 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 15.

Where ZIP 67474 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 15

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 Portis, 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 Portis, 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 15median — 10% chance by Sep 28

Growing season173 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around October 24.

From the NOAA station Smith Center, KS — 13 miles away, elevation 1,821 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 67474

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 20 – Sep 3

GarlicPlant cloves · Oct 1 – Nov 5

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 24) and first fall frost (Oct 15) 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 67474 came on Mar 1 — 20 days earlier than the 1991–2020 average (Mar 21).

average
Mar 212026
Mar 1

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 Portis, KS

The soil mapped at the center of ZIP 67474 is Armo — loam, well drained.

TextureLoama good balance for most vegetables

pH7.6slightly alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Armo loam, 3 to 7 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 67474; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Portis, KS

Summer high92 °Faverage high, July

Winter low16 °Faverage low, January

Hot days61days a year at 90 °F or more

Freezing nights136nights a year at 32 °F or less

Growing degree days3,826base 50 °F — the season’s usable heat

Longest day14 h 58 mindaylight on June 21

Shortest day9 h 22 mindaylight on December 21

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

Precipitation26.9 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: Smith Center, KS (13 mi away); precipitation: Osborne 0.8 Nne, KS (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

Cawker City, KS · 14 mi

674736a

Osborne, KS · 15 mi

669676a

Smith Center, KS · 16 mi

Kansas planting zones →

Questions about 67474

What planting zone is ZIP code 67474?

ZIP code 67474 (Portis, 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 Portis, KS?

The median last spring frost (32 °F) near 67474 is April 24; after May 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Smith Center station.

When is the first frost in Portis, KS?

The median first fall frost near 67474 is October 15, giving a median frost-free growing season of 173 days.

When should I plant tomatoes in 67474?

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 67474 get?

About 26.9 inches of precipitation a year (NOAA 1991–2020 normals, Osborne 0.8 Nne station).

How hot do summers get in Portis, KS?

The average high peaks at 92 °F in July, with about 61 days a year at 90 °F or more.

What kind of soil does 67474 have?

The USDA soil survey maps Armo at the center of ZIP 67474: loam, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Portis, KS in 2026?

Spring leaf-out near 67474 came on Mar 1 in 2026, 20 days earlier than the 1991–2020 average (Mar 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Portis, KS?

Intermediate onions: the longest day near 67474 is 14 h 58 min, so day-neutral types bulb best; long-day varieties may not bulb fully.