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

Planting zone for 64648 — Jamesport, MO

ZIP code 64648 (Jamesport, Daviess County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 19 and the first fall frost October 21.

Where ZIP 64648 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 19
First frostOct 21
2012 zone5b

Was 5b 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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Jamesport, 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 Jamesport, MO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 19median — 50% chance of a later frost
Safe for tender plantsMay 4only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 6
Growing season184 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 7 and returns around October 30.

From the NOAA station Gallatin 1w, MO — 11 miles away, elevation 922 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 64648

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 8 – Mar 22
SpinachSow outdoors · Mar 8 – Mar 29
Broccoli, cabbageStart indoors · Feb 8 – Feb 22
Broccoli, cabbageTransplant · Mar 29 – Apr 12
Onion setsPlant outdoors · Mar 22 – Apr 5
PotatoesPlant outdoors · Mar 29 – Apr 12
LettuceSow outdoors · Mar 22 – Apr 5
Carrots, beetsSow outdoors · Mar 29 – Apr 12
TomatoesStart indoors · Feb 22 – Mar 8
TomatoesTransplant · Apr 26 – May 10
Peppers, eggplantStart indoors · Feb 8 – Feb 22
Peppers, eggplantTransplant · May 3 – May 17
BeansSow outdoors · Apr 26 – May 10
Sweet cornSow outdoors · Apr 26 – May 10
Cucumbers, squashSow outdoors · Apr 26 – May 10
Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9
GarlicPlant cloves · Oct 7 – Nov 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 19) and first fall frost (Oct 21) 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 64648 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 Jamesport, MO

The soil mapped at the center of ZIP 64648 is Edina — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter2.5%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Edina silt loam, 0 to 2 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 64648; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jamesport, MO

Summer high86 °Faverage high, July
Winter low16 °Faverage low, January
Hot days29days a year at 90 °F or more
Freezing nights127nights a year at 32 °F or less
Growing degree days3,461base 50 °F — the season’s usable heat
Longest day15 h 01 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation40.5 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 34 °F, low 16 °F 34°16° JanFebruary: average high 40 °F, low 20 °F 40°20° FebMarch: average high 52 °F, low 30 °F 52°30° MarApril: average high 63 °F, low 40 °F 63°40° AprMay: average high 73 °F, low 52 °F 73°52° MayJune: average high 82 °F, low 62 °F 82°62° JunJuly: average high 86 °F, low 66 °F 86°66° JulAugust: average high 84 °F, low 63 °F 84°63° AugSeptember: average high 77 °F, low 54 °F 77°54° SepOctober: average high 65 °F, low 42 °F 65°42° OctNovember: average high 50 °F, low 31 °F 50°31° NovDecember: average high 38 °F, low 20 °F 38°20° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.25 in precipitation 1.3 JanFebruary: 1.47 in precipitation 1.5 FebMarch: 2.19 in precipitation 2.2 MarApril: 3.80 in precipitation 3.8 AprMay: 5.77 in precipitation 5.8 MayJune: 4.96 in precipitation 5.0 JunJuly: 5.37 in precipitation 5.4 JulAugust: 4.23 in precipitation 4.2 AugSeptember: 4.20 in precipitation 4.2 SepOctober: 3.36 in precipitation 3.4 OctNovember: 2.38 in precipitation 2.4 NovDecember: 1.53 in precipitation 1.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Gallatin 1w, MO (11 mi away); precipitation: Jamesport 1.3 Ese, MO (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

646476a
Jameson, MO · 10 mi
646546a
Lock Springs, MO · 10 mi
646406a
Gallatin, MO · 10 mi
646836a
Trenton, MO · 11 mi
646426a
Gilman City, MO · 13 mi
646366a
Coffey, MO · 14 mi
646016a
Chillicothe, MO · 17 mi
646256a
Breckenridge, MO · 17 mi

Missouri planting zones →

Questions about 64648

What planting zone is ZIP code 64648?

ZIP code 64648 (Jamesport, 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 Jamesport, MO?

The median last spring frost (32 °F) near 64648 is April 19; after May 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Gallatin 1w station.

When is the first frost in Jamesport, MO?

The median first fall frost near 64648 is October 21, giving a median frost-free growing season of 184 days.

When should I plant tomatoes in 64648?

Start tomato seeds indoors around Feb 22 – Mar 8 and set transplants outside around Apr 26 – May 10, one to three weeks after the median last frost.

How much rain and snow does 64648 get?

About 40.5 inches of precipitation a year (NOAA 1991–2020 normals, Jamesport 1.3 Ese station).

How hot do summers get in Jamesport, MO?

The average high peaks at 86 °F in July, with about 29 days a year at 90 °F or more.

What kind of soil does 64648 have?

The USDA soil survey maps Edina at the center of ZIP 64648: silt loam, poorly drained, pH about 6.2 (slightly acidic).

Did spring come early in Jamesport, MO in 2026?

Spring leaf-out near 64648 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 Jamesport, MO?

Long-day onions: the longest day near 64648 is 15 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 64648 change?

Yes. The 2012 USDA map put 64648 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.