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

Planting zone for 65685 — Louisburg, MO

ZIP code 65685 (Louisburg, Dallas County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 23 and the first fall frost October 15.

Where ZIP 65685 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 23
First frostOct 15
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 Louisburg, 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 Louisburg, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 23median — 50% chance of a later frost
Safe for tender plantsMay 8only 10% chance of frost after
First fall frostOctober 15median — 10% chance by Oct 1
Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 9 and returns around October 25.

From the NOAA station Buffalo 2n, MO — 6 miles away, elevation 1,070 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 65685

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 12 – Mar 26
SpinachSow outdoors · Mar 12 – Apr 2
Broccoli, cabbageStart indoors · Feb 12 – Feb 26
Broccoli, cabbageTransplant · Apr 2 – Apr 16
Onion setsPlant outdoors · Mar 26 – Apr 9
PotatoesPlant outdoors · Apr 2 – Apr 16
LettuceSow outdoors · Mar 26 – Apr 9
Carrots, beetsSow outdoors · Apr 2 – Apr 16
TomatoesStart indoors · Feb 26 – Mar 12
TomatoesTransplant · Apr 30 – May 14
Peppers, eggplantStart indoors · Feb 12 – Feb 26
Peppers, eggplantTransplant · May 7 – May 21
BeansSow outdoors · Apr 30 – May 14
Sweet cornSow outdoors · Apr 30 – May 14
Cucumbers, squashSow outdoors · Apr 30 – May 14
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 23) 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 65685 came on Feb 24 — 14 days earlier than the 1991–2020 average (Mar 10).

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 Louisburg, MO

The soil mapped at the center of ZIP 65685 is Ocie — gravelly silt loam, moderately well drained.

TextureGravelly silt loama good balance for most vegetables
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter4%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Ocie-Gatewood complex, 3 to 8 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 65685; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Louisburg, MO

Summer high89 °Faverage high, July
Winter low20 °Faverage low, January
Hot days34days a year at 90 °F or more
Freezing nights108nights a year at 32 °F or less
Growing degree days3,919base 50 °F — the season’s usable heat
Longest day14 h 47 mindaylight on June 21
Shortest day9 h 33 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation43.7 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 43 °F, low 20 °F 43°20° JanFebruary: average high 48 °F, low 24 °F 48°24° FebMarch: average high 58 °F, low 33 °F 58°33° MarApril: average high 68 °F, low 42 °F 68°42° AprMay: average high 76 °F, low 52 °F 76°52° MayJune: average high 84 °F, low 61 °F 84°61° JunJuly: average high 89 °F, low 66 °F 89°66° JulAugust: average high 88 °F, low 64 °F 88°64° AugSeptember: average high 81 °F, low 55 °F 81°55° SepOctober: average high 70 °F, low 43 °F 70°43° OctNovember: average high 57 °F, low 33 °F 57°33° NovDecember: average high 46 °F, low 24 °F 46°24° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.95 in precipitation 1.9 JanFebruary: 1.98 in precipitation 2.0 FebMarch: 3.44 in precipitation 3.4 MarApril: 5.09 in precipitation 5.1 AprMay: 5.91 in precipitation 5.9 MayJune: 4.31 in precipitation 4.3 JunJuly: 3.88 in precipitation 3.9 JulAugust: 4.03 in precipitation 4.0 AugSeptember: 3.98 in precipitation 4.0 SepOctober: 3.64 in precipitation 3.6 OctNovember: 3.12 in precipitation 3.1 NovDecember: 2.39 in precipitation 2.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Buffalo 2n, MO (6 mi away); precipitation: Polk 2 Ne, MO (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

657676b
Urbana, MO · 7 mi
657276b
Polk, MO · 8 mi
656226b
Buffalo, MO · 8 mi
656636b
Half Way, MO · 10 mi
657246b
Pittsburg, MO · 11 mi
657646b
Tunas, MO · 12 mi
655906b
Long Lane, MO · 13 mi
657326b
Preston, MO · 13 mi

Missouri planting zones →

Questions about 65685

What planting zone is ZIP code 65685?

ZIP code 65685 (Louisburg, MO) 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 Louisburg, MO?

The median last spring frost (32 °F) near 65685 is April 23; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Buffalo 2n station.

When is the first frost in Louisburg, MO?

The median first fall frost near 65685 is October 15, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 65685?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 65685 get?

About 43.7 inches of precipitation a year (NOAA 1991–2020 normals, Polk 2 Ne station).

How hot do summers get in Louisburg, MO?

The average high peaks at 89 °F in July, with about 34 days a year at 90 °F or more.

What kind of soil does 65685 have?

The USDA soil survey maps Ocie at the center of ZIP 65685: gravelly silt loam, moderately well drained, pH about 5.8 (moderately acidic).

Did spring come early in Louisburg, MO in 2026?

Spring leaf-out near 65685 came on Feb 24 in 2026, 14 days earlier than the 1991–2020 average (Mar 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Louisburg, MO?

Intermediate onions: the longest day near 65685 is 14 h 47 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 65685 change?

Yes. The 2012 USDA map put 65685 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.