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

Planting zone for 66283 — Overland Park, KS

Q: What planting zone is ZIP code 66283?

ZIP code 66283 (Overland Park, 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).

Q: When is the last frost in Overland Park, KS?

The median last spring frost (32 °F) near 66283 is April 10; after April 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Olathe 3e station.

Q: When is the first frost in Overland Park, KS?

The median first fall frost near 66283 is October 29, giving a median frost-free growing season of 202 days.

Q: When should I plant tomatoes in 66283?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

Q: How much rain and snow does 66283 get?

About 40.7 inches of precipitation a year and 14 inches of snowfall (NOAA 1991–2020 normals, Olathe 3e station).

Q: How hot do summers get in Overland Park, KS?

The average high peaks at 88 °F in July, with about 34 days a year at 90 °F or more.

Q: What kind of soil does 66283 have?

The USDA soil survey maps Martin at the center of ZIP 66283: silty clay loam, moderately well drained, pH about 6.1 (slightly acidic).

Q: Did spring come early in Overland Park, KS in 2026?

Spring leaf-out near 66283 came on Feb 24 in 2026, 20 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

Q: What kind of onions grow in Overland Park, KS?

Intermediate onions: the longest day near 66283 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Q: Did the zone for 66283 change?

Yes. The 2012 USDA map put 66283 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.

ZIP code 66283 (Overland Park, Johnson County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 10 and the first fall frost October 29.

Where ZIP 66283 is

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 10

First frostOct 29

2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Overland Park, 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 Overland Park, KS

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 10median — 50% chance of a later frost

Safe for tender plantsApril 24only 10% chance of frost after

First fall frostOctober 29median — 10% chance by Oct 13

Growing season202 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 6.

From the NOAA station Olathe 3e, KS — 4 miles away, elevation 1,056 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 66283

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 27 – Mar 13

SpinachSow outdoors · Feb 27 – Mar 20

Broccoli, cabbageStart indoors · Jan 30 – Feb 13

Broccoli, cabbageTransplant · Mar 20 – Apr 3

Onion setsPlant outdoors · Mar 13 – Mar 27

PotatoesPlant outdoors · Mar 20 – Apr 3

LettuceSow outdoors · Mar 13 – Mar 27

Carrots, beetsSow outdoors · Mar 20 – Apr 3

TomatoesStart indoors · Feb 13 – Feb 27

TomatoesTransplant · Apr 17 – May 1

Peppers, eggplantStart indoors · Jan 30 – Feb 13

Peppers, eggplantTransplant · Apr 24 – May 8

BeansSow outdoors · Apr 17 – May 1

Sweet cornSow outdoors · Apr 17 – May 1

Cucumbers, squashSow outdoors · Apr 17 – May 1

Fall lettuce, spinachSow outdoors · Sep 3 – Sep 17

GarlicPlant cloves · Oct 15 – Nov 19

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 10) and first fall frost (Oct 29) 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 66283 came on Feb 24 — 20 days earlier than the 1991–2020 average (Mar 16).

average
Mar 162026
Feb 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).

Native plants for zone 6b in Kansas

431 plants native to the lower 48 states, recorded in Kansas, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. 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 Overland Park, KS.

Soil in Overland Park, KS

The soil mapped at the center of ZIP 66283 is Martin — silty clay loam, moderately well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up

pH6.1slightly acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter3.7%moderate

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classprime farmlandUSDA classification

Map unit: Martin silty clay 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 66283; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Overland Park, KS

Summer high88 °Faverage high, July

Winter low20 °Faverage low, January

Hot days34days a year at 90 °F or more

Freezing nights98nights a year at 32 °F or less

Growing degree days4,094base 50 °F — the season’s usable heat

Longest day14 h 54 mindaylight on June 21

Shortest day9 h 26 mindaylight on December 21

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

Precipitation40.7 inper year, rain and melted snow

Snowfall14 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Olathe 3e, KS (4 mi away); precipitation: Olathe 3e, KS (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

Overland Park, KS · <1 mi

662766b

Shawnee Mission, KS · <1 mi

662826b

Overland Park, KS · <1 mi

All 13 ZIP codes in Overland Park → · Kansas planting zones →

Questions about 66283

What planting zone is ZIP code 66283?

ZIP code 66283 (Overland Park, 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 Overland Park, KS?

The median last spring frost (32 °F) near 66283 is April 10; after April 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Olathe 3e station.

When is the first frost in Overland Park, KS?

The median first fall frost near 66283 is October 29, giving a median frost-free growing season of 202 days.

When should I plant tomatoes in 66283?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

How much rain and snow does 66283 get?

About 40.7 inches of precipitation a year and 14 inches of snowfall (NOAA 1991–2020 normals, Olathe 3e station).

How hot do summers get in Overland Park, KS?

The average high peaks at 88 °F in July, with about 34 days a year at 90 °F or more.

What kind of soil does 66283 have?

The USDA soil survey maps Martin at the center of ZIP 66283: silty clay loam, moderately well drained, pH about 6.1 (slightly acidic).

Did spring come early in Overland Park, KS in 2026?

Spring leaf-out near 66283 came on Feb 24 in 2026, 20 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Overland Park, KS?