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

Planting zone for 65076 — Saint Thomas, MO

ZIP code 65076 (Saint Thomas, Cole County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 8 and the first fall frost October 31.

Where ZIP 65076 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 8

First frostOct 31

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 Saint Thomas, 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 Saint Thomas, MO

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 8median — 50% chance of a later frost

Safe for tender plantsApril 23only 10% chance of frost after

First fall frostOctober 31median — 10% chance by Oct 17

Growing season205 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 28 and returns around November 8.

From the NOAA station Jefferson City Wtp, MO — 14 miles away, elevation 650 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 65076

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 25 – Mar 11

SpinachSow outdoors · Feb 25 – Mar 18

Broccoli, cabbageStart indoors · Jan 28 – Feb 11

Broccoli, cabbageTransplant · Mar 18 – Apr 1

Onion setsPlant outdoors · Mar 11 – Mar 25

PotatoesPlant outdoors · Mar 18 – Apr 1

LettuceSow outdoors · Mar 11 – Mar 25

Carrots, beetsSow outdoors · Mar 18 – Apr 1

TomatoesStart indoors · Feb 11 – Feb 25

TomatoesTransplant · Apr 15 – Apr 29

Peppers, eggplantStart indoors · Jan 28 – Feb 11

Peppers, eggplantTransplant · Apr 22 – May 6

BeansSow outdoors · Apr 15 – Apr 29

Sweet cornSow outdoors · Apr 15 – Apr 29

Cucumbers, squashSow outdoors · Apr 15 – Apr 29

Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19

GarlicPlant cloves · Oct 17 – Nov 21

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 8) and first fall frost (Oct 31) 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 65076 came on Feb 28 — 14 days earlier than the 1991–2020 average (Mar 14).

average
Mar 142026
Feb 28

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 Saint Thomas, MO

The soil mapped at the center of ZIP 65076 is Gravois — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH5.5moderately acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Gravois silt loam, 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 65076; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Saint Thomas, MO

Summer high88 °Faverage high, July

Winter low21 °Faverage low, January

Hot days37days a year at 90 °F or more

Freezing nights106nights a year at 32 °F or less

Growing degree days4,107base 50 °F — the season’s usable heat

Longest day14 h 51 mindaylight on June 21

Shortest day9 h 29 mindaylight on December 21

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

Precipitation45.7 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: Jefferson City Wtp, MO (14 mi away); precipitation: Jefferson City 3.0 Ese, MO (13 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

650406b

Henley, MO · 5 mi

650856b

Westphalia, MO · 6 mi

650486b

Koeltztown, MO · 8 mi

650586b

Meta, MO · 8 mi

651016b

Jefferson City, MO · 9 mi

650756b

Saint Elizabeth, MO · 10 mi

650326b

Eugene, MO · 10 mi

651116b

Jefferson City, MO · 11 mi

Missouri planting zones →

Questions about 65076

What planting zone is ZIP code 65076?

ZIP code 65076 (Saint Thomas, 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 Saint Thomas, MO?

The median last spring frost (32 °F) near 65076 is April 8; after April 23 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Jefferson City Wtp station.

When is the first frost in Saint Thomas, MO?

The median first fall frost near 65076 is October 31, giving a median frost-free growing season of 205 days.

When should I plant tomatoes in 65076?

Start tomato seeds indoors around Feb 11 – Feb 25 and set transplants outside around Apr 15 – Apr 29, one to three weeks after the median last frost.

How much rain and snow does 65076 get?

About 45.7 inches of precipitation a year (NOAA 1991–2020 normals, Jefferson City 3.0 Ese station).

How hot do summers get in Saint Thomas, 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 65076 have?

The USDA soil survey maps Gravois at the center of ZIP 65076: silt loam, moderately well drained, pH about 5.5 (moderately acidic).

Did spring come early in Saint Thomas, MO in 2026?

Spring leaf-out near 65076 came on Feb 28 in 2026, 14 days earlier than the 1991–2020 average (Mar 14), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Saint Thomas, MO?

Intermediate onions: the longest day near 65076 is 14 h 51 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 65076 change?

Yes. The 2012 USDA map put 65076 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.