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

Planting zone for 64628 — Brookfield, MO

ZIP code 64628 (Brookfield, Linn County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 14 and the first fall frost October 23.

Where ZIP 64628 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 14
First frostOct 23
2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Brookfield, 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 Brookfield, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 14median — 50% chance of a later frost
Safe for tender plantsApril 28only 10% chance of frost after
First fall frostOctober 23median — 10% chance by Oct 9
Growing season192 daysfrost-free, median

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

From the NOAA station Brookfield, MO — 2 miles away, elevation 768 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 64628

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 3 – Mar 17
SpinachSow outdoors · Mar 3 – Mar 24
Broccoli, cabbageStart indoors · Feb 3 – Feb 17
Broccoli, cabbageTransplant · Mar 24 – Apr 7
Onion setsPlant outdoors · Mar 17 – Mar 31
PotatoesPlant outdoors · Mar 24 – Apr 7
LettuceSow outdoors · Mar 17 – Mar 31
Carrots, beetsSow outdoors · Mar 24 – Apr 7
TomatoesStart indoors · Feb 17 – Mar 3
TomatoesTransplant · Apr 21 – May 5
Peppers, eggplantStart indoors · Feb 3 – Feb 17
Peppers, eggplantTransplant · Apr 28 – May 12
BeansSow outdoors · Apr 21 – May 5
Sweet cornSow outdoors · Apr 21 – May 5
Cucumbers, squashSow outdoors · Apr 21 – May 5
Fall lettuce, spinachSow outdoors · Aug 28 – Sep 11
GarlicPlant cloves · Oct 9 – Nov 13
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 14) and first fall frost (Oct 23) 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 64628 came on Mar 11 — 13 days earlier than the 1991–2020 average (Mar 24).

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 Brookfield, MO

The soil mapped at the center of ZIP 64628 is Fatima — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH6.1slightly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if protected from flooding or not frequently flooded during the growing seasonUSDA classification

Map unit: Fatima silt loam, 0 to 2 percent slopes, frequently 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 64628; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Brookfield, MO

Summer high87 °Faverage high, July
Winter low18 °Faverage low, January
Hot days28days a year at 90 °F or more
Freezing nights121nights a year at 32 °F or less
Growing degree days3,843base 50 °F — the season’s usable heat
Longest day15 h 00 mindaylight on June 21
Shortest day9 h 21 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation42.2 inper year, rain and melted snow
Snowfall19 inper year; 30 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 36 °F, low 18 °F 36°18° JanFebruary: average high 42 °F, low 22 °F 42°22° FebMarch: average high 54 °F, low 32 °F 54°32° MarApril: average high 65 °F, low 42 °F 65°42° AprMay: average high 74 °F, low 54 °F 74°54° MayJune: average high 83 °F, low 63 °F 83°63° JunJuly: average high 87 °F, low 67 °F 87°67° JulAugust: average high 86 °F, low 65 °F 86°65° AugSeptember: average high 79 °F, low 56 °F 79°56° SepOctober: average high 67 °F, low 45 °F 67°45° OctNovember: average high 53 °F, low 33 °F 53°33° NovDecember: average high 41 °F, low 23 °F 41°23° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 1.50 in precipitation, 4.8 in snowfall 1.5❄5 JanFebruary: 1.82 in precipitation, 5.9 in snowfall 1.8❄6 FebMarch: 2.90 in precipitation, 2.5 in snowfall 2.9❄3 MarApril: 3.95 in precipitation, 0.2 in snowfall 4.0 AprMay: 5.53 in precipitation 5.5 MayJune: 5.49 in precipitation 5.5 JunJuly: 4.92 in precipitation 4.9 JulAugust: 4.37 in precipitation 4.4 AugSeptember: 3.99 in precipitation 4.0 SepOctober: 3.43 in precipitation, 0.1 in snowfall 3.4 OctNovember: 2.52 in precipitation, 1.2 in snowfall 2.5❄1 NovDecember: 1.80 in precipitation, 4.2 in snowfall 1.8❄4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Brookfield, MO (2 mi away); precipitation: Brookfield, MO (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

646516a
Laclede, MO · 7 mi
646316a
Bucklin, MO · 9 mi
646766a
Rothville, MO · 10 mi
646536a
Linneus, MO · 10 mi
646586a
Marceline, MO · 11 mi
646596a
Meadville, MO · 13 mi
646816a
Sumner, MO · 13 mi
646746a
Purdin, MO · 13 mi

Missouri planting zones →

Questions about 64628

What planting zone is ZIP code 64628?

ZIP code 64628 (Brookfield, MO) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Brookfield, MO?

The median last spring frost (32 °F) near 64628 is April 14; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Brookfield station.

When is the first frost in Brookfield, MO?

The median first fall frost near 64628 is October 23, giving a median frost-free growing season of 192 days.

When should I plant tomatoes in 64628?

Start tomato seeds indoors around Feb 17 – Mar 3 and set transplants outside around Apr 21 – May 5, one to three weeks after the median last frost.

How much rain and snow does 64628 get?

About 42.2 inches of precipitation a year and 19 inches of snowfall (NOAA 1991–2020 normals, Brookfield station).

How hot do summers get in Brookfield, MO?

The average high peaks at 87 °F in July, with about 28 days a year at 90 °F or more.

What kind of soil does 64628 have?

The USDA soil survey maps Fatima at the center of ZIP 64628: silt loam, moderately well drained, pH about 6.1 (slightly acidic).

Did spring come early in Brookfield, MO in 2026?

Spring leaf-out near 64628 came on Mar 11 in 2026, 13 days earlier than the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Brookfield, MO?

Intermediate onions: the longest day near 64628 is 15 h 00 min, so day-neutral types bulb best; long-day varieties may not bulb fully.