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

Planting zone for 63666 — Reynolds, MO

ZIP code 63666 (Reynolds, Reynolds County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 24 and the first fall frost October 16.

Where ZIP 63666 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 24
First frostOct 16
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 Reynolds, 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 Reynolds, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 24median — 50% chance of a later frost
Safe for tender plantsMay 8only 10% chance of frost after
First fall frostOctober 16median — 10% chance by Oct 4
Growing season172 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around October 25.

From the NOAA station Round Spring 2sw, MO — 22 miles away, elevation 830 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 63666

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 13 – Mar 27
SpinachSow outdoors · Mar 13 – Apr 3
Broccoli, cabbageStart indoors · Feb 13 – Feb 27
Broccoli, cabbageTransplant · Apr 3 – Apr 17
Onion setsPlant outdoors · Mar 27 – Apr 10
PotatoesPlant outdoors · Apr 3 – Apr 17
LettuceSow outdoors · Mar 27 – Apr 10
Carrots, beetsSow outdoors · Apr 3 – Apr 17
TomatoesStart indoors · Feb 27 – Mar 13
TomatoesTransplant · May 1 – May 15
Peppers, eggplantStart indoors · Feb 13 – Feb 27
Peppers, eggplantTransplant · May 8 – May 22
BeansSow outdoors · May 1 – May 15
Sweet cornSow outdoors · May 1 – May 15
Cucumbers, squashSow outdoors · May 1 – May 15
Fall lettuce, spinachSow outdoors · Aug 21 – Sep 4
GarlicPlant cloves · Oct 2 – Nov 6
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 24) and first fall frost (Oct 16) 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 63666 came on Feb 28 — 11 days earlier than the 1991–2020 average (Mar 11).

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 6b in Missouri

525 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 6b. Each links to its USDA PLANTS profile.

Trees 70

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 83

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 192

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 157

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 12

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °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 Reynolds, MO.

Soil in Reynolds, MO

The soil mapped at the center of ZIP 63666 is Tonti — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter2%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Tonti-Hogcreek 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 63666; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Reynolds, MO

Summer high90 °Faverage high, July
Winter low20 °Faverage low, January
Hot days47days a year at 90 °F or more
Freezing nights129nights a year at 32 °F or less
Growing degree days3,881base 50 °F — the season’s usable heat
Longest day14 h 45 mindaylight on June 21
Shortest day9 h 35 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation48.6 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 45 °F, low 20 °F 45°20° JanFebruary: average high 50 °F, low 23 °F 50°23° FebMarch: average high 60 °F, low 32 °F 60°32° MarApril: average high 71 °F, low 40 °F 71°40° AprMay: average high 78 °F, low 51 °F 78°51° MayJune: average high 85 °F, low 60 °F 85°60° JunJuly: average high 90 °F, low 65 °F 90°65° JulAugust: average high 88 °F, low 63 °F 88°63° AugSeptember: average high 81 °F, low 54 °F 81°54° SepOctober: average high 71 °F, low 41 °F 71°41° OctNovember: average high 59 °F, low 32 °F 59°32° NovDecember: average high 47 °F, low 24 °F 47°24° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 2.80 in precipitation 2.8 JanFebruary: 2.61 in precipitation 2.6 FebMarch: 4.41 in precipitation 4.4 MarApril: 5.70 in precipitation 5.7 AprMay: 5.64 in precipitation 5.6 MayJune: 4.30 in precipitation 4.3 JunJuly: 4.03 in precipitation 4.0 JulAugust: 4.25 in precipitation 4.3 AugSeptember: 3.73 in precipitation 3.7 SepOctober: 3.53 in precipitation 3.5 OctNovember: 4.25 in precipitation 4.3 NovDecember: 3.33 in precipitation 3.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Round Spring 2sw, MO (22 mi away); precipitation: Ellington 5.8 Se, MO (18 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

636336b
Centerville, MO · 4 mi
636296b
Bunker, MO · 9 mi
636256b
Black, MO · 12 mi
636386b
Ellington, MO · 13 mi
636546b
Lesterville, MO · 13 mi
636656b
Redford, MO · 15 mi
654406b
Boss, MO · 15 mi
654396b
Bixby, MO · 18 mi

Missouri planting zones →

Questions about 63666

What planting zone is ZIP code 63666?

ZIP code 63666 (Reynolds, 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 Reynolds, MO?

The median last spring frost (32 °F) near 63666 is April 24; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Round Spring 2sw station.

When is the first frost in Reynolds, MO?

The median first fall frost near 63666 is October 16, giving a median frost-free growing season of 172 days.

When should I plant tomatoes in 63666?

Start tomato seeds indoors around Feb 27 – Mar 13 and set transplants outside around May 1 – May 15, one to three weeks after the median last frost.

How much rain and snow does 63666 get?

About 48.6 inches of precipitation a year (NOAA 1991–2020 normals, Ellington 5.8 Se station).

How hot do summers get in Reynolds, MO?

The average high peaks at 90 °F in July, with about 47 days a year at 90 °F or more.

What kind of soil does 63666 have?

The USDA soil survey maps Tonti at the center of ZIP 63666: silt loam, moderately well drained, pH about 5.0 (strongly acidic).

Did spring come early in Reynolds, MO in 2026?

Spring leaf-out near 63666 came on Feb 28 in 2026, 11 days earlier than the 1991–2020 average (Mar 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Reynolds, MO?

Intermediate onions: the longest day near 63666 is 14 h 45 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 63666 change?

Yes. The 2012 USDA map put 63666 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.