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

Planting zone for 64441 — Denver, MO

ZIP code 64441 (Denver, Worth County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 24 and the first fall frost October 14.

Where ZIP 64441 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostApr 24
First frostOct 14
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Denver, 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 Denver, 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 7only 10% chance of frost after
First fall frostOctober 14median — 10% chance by Sep 29
Growing season172 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 14 and returns around October 25.

From the NOAA station Grant City, MO — 10 miles away, elevation 1,129 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 64441

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 19 – Sep 2
GarlicPlant cloves · Sep 30 – Nov 4
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 24) and first fall frost (Oct 14) 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 64441 came on Mar 11 — 16 days earlier than the 1991–2020 average (Mar 27).

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 Denver, MO

The soil mapped at the center of ZIP 64441 is Shelby — loam, well drained.

TextureLoama good balance for most vegetables
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.75%moderate
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if drainedUSDA classification

Map unit: Shelby-Adair loams, heavy till plain, 5 to 9 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 64441; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Denver, MO

Summer high85 °Faverage high, July
Winter low13 °Faverage low, January
Hot days20days a year at 90 °F or more
Freezing nights138nights a year at 32 °F or less
Growing degree days3,269base 50 °F — the season’s usable heat
Longest day15 h 03 mindaylight on June 21
Shortest day9 h 17 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation38.9 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 33 °F, low 13 °F 33°13° JanFebruary: average high 39 °F, low 17 °F 39°17° FebMarch: average high 51 °F, low 27 °F 51°27° MarApril: average high 62 °F, low 38 °F 62°38° AprMay: average high 72 °F, low 51 °F 72°51° MayJune: average high 80 °F, low 60 °F 80°60° JunJuly: average high 85 °F, low 65 °F 85°65° JulAugust: average high 84 °F, low 63 °F 84°63° AugSeptember: average high 77 °F, low 53 °F 77°53° SepOctober: average high 64 °F, low 41 °F 64°41° OctNovember: average high 50 °F, low 28 °F 50°28° NovDecember: average high 37 °F, low 18 °F 37°18° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.02 in precipitation 1.0 JanFebruary: 1.31 in precipitation 1.3 FebMarch: 2.30 in precipitation 2.3 MarApril: 3.74 in precipitation 3.7 AprMay: 5.63 in precipitation 5.6 MayJune: 5.80 in precipitation 5.8 JunJuly: 4.72 in precipitation 4.7 JulAugust: 3.94 in precipitation 3.9 AugSeptember: 4.01 in precipitation 4.0 SepOctober: 2.95 in precipitation 3.0 OctNovember: 1.91 in precipitation 1.9 NovDecember: 1.54 in precipitation 1.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Grant City, MO (10 mi away); precipitation: Albany 0.7 Ne, MO (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

644675b
Martinsville, MO · 5 mi
644205b
Allendale, MO · 7 mi
644995b
Worth, MO · 8 mi
644565b
Grant City, MO · 9 mi
644715b
New Hampton, MO · 10 mi
644026a
Albany, MO · 10 mi
644585b
Hatfield, MO · 11 mi
644535b
Gentry, MO · 11 mi

Missouri planting zones →

Questions about 64441

What planting zone is ZIP code 64441?

ZIP code 64441 (Denver, MO) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Denver, MO?

The median last spring frost (32 °F) near 64441 is April 24; after May 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Grant City station.

When is the first frost in Denver, MO?

The median first fall frost near 64441 is October 14, giving a median frost-free growing season of 172 days.

When should I plant tomatoes in 64441?

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 64441 get?

About 38.9 inches of precipitation a year (NOAA 1991–2020 normals, Albany 0.7 Ne station).

How hot do summers get in Denver, MO?

The average high peaks at 85 °F in July, with about 20 days a year at 90 °F or more.

What kind of soil does 64441 have?

The USDA soil survey maps Shelby at the center of ZIP 64441: loam, well drained, pH about 6.2 (slightly acidic).

Did spring come early in Denver, MO in 2026?

Spring leaf-out near 64441 came on Mar 11 in 2026, 16 days earlier than the 1991–2020 average (Mar 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Denver, MO?

Long-day onions: the longest day near 64441 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).