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

Planting zone for 65791 — Thayer, MO

ZIP code 65791 (Thayer, Oregon County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 12 and the first fall frost October 24.

Where ZIP 65791 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 12
First frostOct 24
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Thayer, 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 Thayer, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 12median — 50% chance of a later frost
Safe for tender plantsApril 27only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 11
Growing season194 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 1 and returns around November 3.

From the NOAA station Mammoth Spring, AR — 6 miles away, elevation 502 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 65791

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 1 – Mar 15
SpinachSow outdoors · Mar 1 – Mar 22
Broccoli, cabbageStart indoors · Feb 1 – Feb 15
Broccoli, cabbageTransplant · Mar 22 – Apr 5
Onion setsPlant outdoors · Mar 15 – Mar 29
PotatoesPlant outdoors · Mar 22 – Apr 5
LettuceSow outdoors · Mar 15 – Mar 29
Carrots, beetsSow outdoors · Mar 22 – Apr 5
TomatoesStart indoors · Feb 15 – Mar 1
TomatoesTransplant · Apr 19 – May 3
Peppers, eggplantStart indoors · Feb 1 – Feb 15
Peppers, eggplantTransplant · Apr 26 – May 10
BeansSow outdoors · Apr 19 – May 3
Sweet cornSow outdoors · Apr 19 – May 3
Cucumbers, squashSow outdoors · Apr 19 – May 3
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 12) and first fall frost (Oct 24) 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 65791 came on Feb 24 — 9 days earlier than the 1991–2020 average (Mar 5).

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 7a in Missouri

540 plants native to the lower 48 states, recorded in Missouri, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 72

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Fbald cypress130 ft · blooms mid spring · medium shade tolerance · to −18 °F

Shrubs 85

alternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 195

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 163

alkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fblister sedge3 ft · blooms late spring · medium shade tolerance · to −38 °F

Vines 14

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

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 Thayer, MO.

Soil in Thayer, MO

The soil mapped at the center of ZIP 65791 is Secesh — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.7neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.4%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Secesh-Tilk complex, 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 65791; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Thayer, MO

Summer high90 °Faverage high, July
Winter low23 °Faverage low, January
Hot days49days a year at 90 °F or more
Freezing nights103nights a year at 32 °F or less
Growing degree days4,294base 50 °F — the season’s usable heat
Longest day14 h 40 mindaylight on June 21
Shortest day9 h 39 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation48.8 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 47 °F, low 23 °F 47°23° JanFebruary: average high 52 °F, low 27 °F 52°27° FebMarch: average high 61 °F, low 35 °F 61°35° MarApril: average high 71 °F, low 44 °F 71°44° AprMay: average high 78 °F, low 54 °F 78°54° MayJune: average high 86 °F, low 63 °F 86°63° JunJuly: average high 90 °F, low 66 °F 90°66° JulAugust: average high 90 °F, low 65 °F 90°65° AugSeptember: average high 82 °F, low 57 °F 82°57° SepOctober: average high 72 °F, low 44 °F 72°44° OctNovember: average high 60 °F, low 34 °F 60°34° NovDecember: average high 50 °F, low 27 °F 50°27° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.56 in precipitation 3.6 JanFebruary: 3.48 in precipitation 3.5 FebMarch: 4.62 in precipitation 4.6 MarApril: 5.21 in precipitation 5.2 AprMay: 5.31 in precipitation 5.3 MayJune: 3.34 in precipitation 3.3 JunJuly: 3.95 in precipitation 4.0 JulAugust: 3.49 in precipitation 3.5 AugSeptember: 3.64 in precipitation 3.6 SepOctober: 3.77 in precipitation 3.8 OctNovember: 4.59 in precipitation 4.6 NovDecember: 3.79 in precipitation 3.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mammoth Spring, AR (6 mi away); precipitation: Mammoth Spring, AR (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

656927a
Koshkonong, MO · 9 mi
725547a
Mammoth Spring, AR · 10 mi
656067a
Alton, MO · 11 mi
656887a
Brandsville, MO · 12 mi
656907a
Couch, MO · 13 mi
657787a
Myrtle, MO · 13 mi
725207a
Camp, AR · 18 mi
657887a
Peace Valley, MO · 19 mi

Missouri planting zones →

Questions about 65791

What planting zone is ZIP code 65791?

ZIP code 65791 (Thayer, MO) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Thayer, MO?

The median last spring frost (32 °F) near 65791 is April 12; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mammoth Spring station.

When is the first frost in Thayer, MO?

The median first fall frost near 65791 is October 24, giving a median frost-free growing season of 194 days.

When should I plant tomatoes in 65791?

Start tomato seeds indoors around Feb 15 – Mar 1 and set transplants outside around Apr 19 – May 3, one to three weeks after the median last frost.

How much rain and snow does 65791 get?

About 48.8 inches of precipitation a year (NOAA 1991–2020 normals, Mammoth Spring station).

How hot do summers get in Thayer, MO?

The average high peaks at 90 °F in July, with about 49 days a year at 90 °F or more.

What kind of soil does 65791 have?

The USDA soil survey maps Secesh at the center of ZIP 65791: silt loam, well drained, pH about 6.7 (neutral).

Did spring come early in Thayer, MO in 2026?

Spring leaf-out near 65791 came on Feb 24 in 2026, 9 days earlier than the 1991–2020 average (Mar 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Thayer, MO?

Intermediate onions: the longest day near 65791 is 14 h 40 min, so day-neutral types bulb best; long-day varieties may not bulb fully.