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

Planting zone for 64073 — Mosby, MO

ZIP code 64073 (Mosby, Clay County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 19 and the first fall frost October 17.

Where ZIP 64073 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 19
First frostOct 17
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 Mosby, 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 Mosby, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 19median — 50% chance of a later frost
Safe for tender plantsMay 5only 10% chance of frost after
First fall frostOctober 17median — 10% chance by Oct 4
Growing season181 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 8 and returns around October 27.

From the NOAA station Kearney 3e, MO — 4 miles away, elevation 840 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 64073

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 8 – Mar 22
SpinachSow outdoors · Mar 8 – Mar 29
Broccoli, cabbageStart indoors · Feb 8 – Feb 22
Broccoli, cabbageTransplant · Mar 29 – Apr 12
Onion setsPlant outdoors · Mar 22 – Apr 5
PotatoesPlant outdoors · Mar 29 – Apr 12
LettuceSow outdoors · Mar 22 – Apr 5
Carrots, beetsSow outdoors · Mar 29 – Apr 12
TomatoesStart indoors · Feb 22 – Mar 8
TomatoesTransplant · Apr 26 – May 10
Peppers, eggplantStart indoors · Feb 8 – Feb 22
Peppers, eggplantTransplant · May 3 – May 17
BeansSow outdoors · Apr 26 – May 10
Sweet cornSow outdoors · Apr 26 – May 10
Cucumbers, squashSow outdoors · Apr 26 – May 10
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 19) 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 64073 came on Mar 4 — 17 days earlier than the 1991–2020 average (Mar 21).

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 Mosby, MO

The soil mapped at the center of ZIP 64073 is Zook — silty clay loam, poorly drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH6.1slightly acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter6%high
Hydrologic groupDwater soaks in very slowly
Farmland classPrime farmland if drainedUSDA classification

Map unit: Zook silty clay loam, heavy till, 0 to 2 percent slopes, occasionally flooded.

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 64073; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mosby, MO

Summer high88 °Faverage high, July
Winter low17 °Faverage low, January
Hot days37days a year at 90 °F or more
Freezing nights128nights a year at 32 °F or less
Growing degree days3,832base 50 °F — the season’s usable heat
Longest day14 h 56 mindaylight on June 21
Shortest day9 h 24 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation41.1 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 17 °F 38°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 64 °F 87°64° AugSeptember: average high 80 °F, low 55 °F 80°55° SepOctober: average high 68 °F, low 43 °F 68°43° OctNovember: average high 55 °F, low 31 °F 55°31° NovDecember: average high 42 °F, low 22 °F 42°22° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.26 in precipitation 1.3 JanFebruary: 1.47 in precipitation 1.5 FebMarch: 2.52 in precipitation 2.5 MarApril: 4.06 in precipitation 4.1 AprMay: 5.87 in precipitation 5.9 MayJune: 5.33 in precipitation 5.3 JunJuly: 4.66 in precipitation 4.7 JulAugust: 4.46 in precipitation 4.5 AugSeptember: 4.27 in precipitation 4.3 SepOctober: 3.28 in precipitation 3.3 OctNovember: 2.39 in precipitation 2.4 NovDecember: 1.50 in precipitation 1.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Kearney 3e, MO (4 mi away); precipitation: Liberty 9.4 Nne, MO (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

640246a
Excelsior Springs, MO · 4 mi
640726a
Missouri City, MO · 5 mi
640606a
Kearney, MO · 6 mi
640686a
Liberty, MO · 6 mi
641446b
Kansas City, MO · 7 mi
640696a
Liberty, MO · 8 mi
640486a
Holt, MO · 9 mi
640586a
Independence, MO · 10 mi

Missouri planting zones →

Questions about 64073

What planting zone is ZIP code 64073?

ZIP code 64073 (Mosby, 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 Mosby, MO?

The median last spring frost (32 °F) near 64073 is April 19; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Kearney 3e station.

When is the first frost in Mosby, MO?

The median first fall frost near 64073 is October 17, giving a median frost-free growing season of 181 days.

When should I plant tomatoes in 64073?

Start tomato seeds indoors around Feb 22 – Mar 8 and set transplants outside around Apr 26 – May 10, one to three weeks after the median last frost.

How much rain and snow does 64073 get?

About 41.1 inches of precipitation a year (NOAA 1991–2020 normals, Liberty 9.4 Nne station).

How hot do summers get in Mosby, MO?

The average high peaks at 88 °F in July, with about 37 days a year at 90 °F or more.

What kind of soil does 64073 have?

The USDA soil survey maps Zook at the center of ZIP 64073: silty clay loam, poorly drained, pH about 6.1 (slightly acidic).

Did spring come early in Mosby, MO in 2026?

Spring leaf-out near 64073 came on Mar 4 in 2026, 17 days earlier than the 1991–2020 average (Mar 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mosby, MO?

Intermediate onions: the longest day near 64073 is 14 h 56 min, so day-neutral types bulb best; long-day varieties may not bulb fully.