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

Planting zone for 64668 — Norborne, MO

ZIP code 64668 (Norborne, Carroll County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 16 and the first fall frost October 23.

Where ZIP 64668 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 16
First frostOct 23
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 Norborne, MO…

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 Norborne, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 1only 10% chance of frost after
First fall frostOctober 23median — 10% chance by Oct 7
Growing season187 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 1.

From the NOAA station Carrollton, MO — 12 miles away, elevation 705 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 64668

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Aug 28 – Sep 11
GarlicPlant cloves · Oct 9 – Nov 13
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 23) 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 64668 came on Mar 5 — 17 days earlier than the 1991–2020 average (Mar 22).

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 Norborne, MO

The soil mapped at the center of ZIP 64668 is Wakenda — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3.4%moderate
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Wakenda silt loam, 2 to 5 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 64668; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Norborne, MO

Summer high88 °Faverage high, July
Winter low17 °Faverage low, January
Hot days38days a year at 90 °F or more
Freezing nights117nights a year at 32 °F or less
Growing degree days3,838base 50 °F — the season’s usable heat
Longest day14 h 57 mindaylight on June 21
Shortest day9 h 23 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation40.1 inper year, rain and melted snow
Snowfall13 inper year; 15 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 37 °F, low 17 °F 37°17° JanFebruary: average high 43 °F, low 21 °F 43°21° FebMarch: average high 55 °F, low 31 °F 55°31° MarApril: average high 66 °F, low 41 °F 66°41° AprMay: average high 75 °F, low 53 °F 75°53° MayJune: average high 84 °F, low 63 °F 84°63° JunJuly: average high 88 °F, low 67 °F 88°67° JulAugust: average high 87 °F, low 65 °F 87°65° AugSeptember: average high 80 °F, low 56 °F 80°56° SepOctober: average high 68 °F, low 43 °F 68°43° OctNovember: average high 54 °F, low 32 °F 54°32° NovDecember: average high 42 °F, low 23 °F 42°23° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 1.41 in precipitation, 4.8 in snowfall 1.4❄5 JanFebruary: 1.85 in precipitation, 3.3 in snowfall 1.9❄3 FebMarch: 2.51 in precipitation, 1.1 in snowfall 2.5❄1 MarApril: 3.92 in precipitation, 0.2 in snowfall 3.9 AprMay: 5.13 in precipitation 5.1 MayJune: 5.37 in precipitation 5.4 JunJuly: 4.27 in precipitation 4.3 JulAugust: 4.39 in precipitation 4.4 AugSeptember: 4.28 in precipitation 4.3 SepOctober: 3.16 in precipitation, 0.3 in snowfall 3.2 OctNovember: 2.21 in precipitation, 0.9 in snowfall 2.2❄1 NovDecember: 1.58 in precipitation, 2.1 in snowfall 1.6❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Carrollton, MO (12 mi away); precipitation: Carrollton, MO (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

646806a
Stet, MO · 6 mi
640356a
Hardin, MO · 7 mi
640226b
Dover, MO · 11 mi
646336a
Carrollton, MO · 12 mi
646226a
Bogard, MO · 13 mi
640856a
Richmond, MO · 13 mi
640966b
Waverly, MO · 13 mi
640676a
Lexington, MO · 16 mi

Missouri planting zones →

Questions about 64668

What planting zone is ZIP code 64668?

ZIP code 64668 (Norborne, MO) 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 Norborne, MO?

The median last spring frost (32 °F) near 64668 is April 16; after May 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Carrollton station.

When is the first frost in Norborne, MO?

The median first fall frost near 64668 is October 23, giving a median frost-free growing season of 187 days.

When should I plant tomatoes in 64668?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 64668 get?

About 40.1 inches of precipitation a year and 13 inches of snowfall (NOAA 1991–2020 normals, Carrollton station).

How hot do summers get in Norborne, MO?

The average high peaks at 88 °F in July, with about 38 days a year at 90 °F or more.

What kind of soil does 64668 have?

The USDA soil survey maps Wakenda at the center of ZIP 64668: silt loam, well drained, pH about 5.8 (moderately acidic).

Did spring come early in Norborne, MO in 2026?

Spring leaf-out near 64668 came on Mar 5 in 2026, 17 days earlier than the 1991–2020 average (Mar 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Norborne, MO?

Intermediate onions: the longest day near 64668 is 14 h 57 min, so day-neutral types bulb best; long-day varieties may not bulb fully.