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

Planting zone for 63962 — Rombauer, MO

ZIP code 63962 (Rombauer, Butler County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 2 and the first fall frost November 2.

Where ZIP 63962 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostApr 2

First frostNov 2

2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Rombauer, 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 Rombauer, MO

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 2median — 50% chance of a later frost

Safe for tender plantsApril 18only 10% chance of frost after

First fall frostNovember 2median — 10% chance by Oct 21

Growing season215 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 21 and returns around November 14.

From the NOAA station Wappapello Dam, MO — 6 miles away, elevation 410 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 63962

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 19 – Mar 5

SpinachSow outdoors · Feb 19 – Mar 12

Broccoli, cabbageStart indoors · Jan 22 – Feb 5

Broccoli, cabbageTransplant · Mar 12 – Mar 26

Onion setsPlant outdoors · Mar 5 – Mar 19

PotatoesPlant outdoors · Mar 12 – Mar 26

LettuceSow outdoors · Mar 5 – Mar 19

Carrots, beetsSow outdoors · Mar 12 – Mar 26

TomatoesStart indoors · Feb 5 – Feb 19

TomatoesTransplant · Apr 9 – Apr 23

Peppers, eggplantStart indoors · Jan 22 – Feb 5

Peppers, eggplantTransplant · Apr 16 – Apr 30

BeansSow outdoors · Apr 9 – Apr 23

Sweet cornSow outdoors · Apr 9 – Apr 23

Cucumbers, squashSow outdoors · Apr 9 – Apr 23

Fall lettuce, spinachSow outdoors · Sep 7 – Sep 21

GarlicPlant cloves · Oct 19 – Nov 23

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 2) and first fall frost (Nov 2) 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 63962 came on Mar 1 — 4 days earlier than the 1991–2020 average (Mar 5).

average
Mar 52026
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).

Native plants for zone 7b in Missouri

542 plants native to the lower 48 states, recorded in Missouri, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. 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 Rombauer, MO.

Soil in Rombauer, MO

The soil mapped at the center of ZIP 63962 is Calhoun — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables

pH5.3strongly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter2.6%moderate

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classPrime farmland if drainedUSDA classification

Map unit: Calhoun silt loam, 0 to 1 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 63962; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Rombauer, MO

Summer high88 °Faverage high, July

Winter low24 °Faverage low, January

Hot days53days a year at 90 °F or more

Freezing nights92nights a year at 32 °F or less

Growing degree days4,250base 50 °F — the season’s usable heat

Longest day14 h 41 mindaylight on June 21

Shortest day9 h 38 mindaylight on December 21

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

Precipitation51.4 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: Wappapello Dam, MO (6 mi away); precipitation: Wappapello Dam, MO (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

639407b

Fisk, MO · 6 mi

639667a

Wappapello, MO · 8 mi

639367b

Dudley, MO · 9 mi

639017a

Poplar Bluff, MO · 11 mi

Poplar Bluff, MO · 11 mi

639677a

Williamsville, MO · 13 mi

Missouri planting zones →

Questions about 63962

What planting zone is ZIP code 63962?

ZIP code 63962 (Rombauer, MO) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Rombauer, MO?

The median last spring frost (32 °F) near 63962 is April 2; after April 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wappapello Dam station.

When is the first frost in Rombauer, MO?

The median first fall frost near 63962 is November 2, giving a median frost-free growing season of 215 days.

When should I plant tomatoes in 63962?

Start tomato seeds indoors around Feb 5 – Feb 19 and set transplants outside around Apr 9 – Apr 23, one to three weeks after the median last frost.

How much rain and snow does 63962 get?

About 51.4 inches of precipitation a year (NOAA 1991–2020 normals, Wappapello Dam station).

How hot do summers get in Rombauer, MO?

The average high peaks at 88 °F in July, with about 53 days a year at 90 °F or more.

What kind of soil does 63962 have?

The USDA soil survey maps Calhoun at the center of ZIP 63962: silt loam, poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Rombauer, MO in 2026?

Spring leaf-out near 63962 came on Mar 1 in 2026, 4 days earlier than the 1991–2020 average (Mar 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Rombauer, MO?

Intermediate onions: the longest day near 63962 is 14 h 41 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 63962 change?

Yes. The 2012 USDA map put 63962 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.