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

Planting zone for 65550 — Newburg, MO

ZIP code 65550 (Newburg, Phelps County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 14 and the first fall frost October 24.

Where ZIP 65550 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 14
First frostOct 24
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 Newburg, 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 Newburg, 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 30only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 11
Growing season193 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 2 and returns around November 1.

From the NOAA station Ft Leonard Wood, MO — 11 miles away, elevation 1,122 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 65550

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 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 14) 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 65550 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).

Soil in Newburg, MO

The soil mapped at the center of ZIP 65550 is Razort — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.8neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Razort silt loam, 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 65550; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Newburg, MO

Summer high88 °Faverage high, July
Winter low22 °Faverage low, January
Hot days35days a year at 90 °F or more
Freezing nights111nights a year at 32 °F or less
Growing degree days3,947base 50 °F — the season’s usable heat
Longest day14 h 47 mindaylight on June 21
Shortest day9 h 32 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation47.5 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 42 °F, low 22 °F 42°22° JanFebruary: average high 47 °F, low 26 °F 47°26° FebMarch: average high 57 °F, low 33 °F 57°33° MarApril: average high 68 °F, low 43 °F 68°43° AprMay: average high 75 °F, low 53 °F 75°53° MayJune: average high 83 °F, low 62 °F 83°62° JunJuly: average high 88 °F, low 66 °F 88°66° JulAugust: average high 87 °F, low 64 °F 87°64° AugSeptember: average high 80 °F, low 56 °F 80°56° SepOctober: average high 69 °F, low 45 °F 69°45° OctNovember: average high 56 °F, low 34 °F 56°34° NovDecember: average high 46 °F, low 26 °F 46°26° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 2.63 in precipitation 2.6 JanFebruary: 2.37 in precipitation 2.4 FebMarch: 3.89 in precipitation 3.9 MarApril: 5.03 in precipitation 5.0 AprMay: 5.26 in precipitation 5.3 MayJune: 4.08 in precipitation 4.1 JunJuly: 5.93 in precipitation 5.9 JulAugust: 4.02 in precipitation 4.0 AugSeptember: 4.06 in precipitation 4.1 SepOctober: 3.38 in precipitation 3.4 OctNovember: 4.00 in precipitation 4.0 NovDecember: 2.82 in precipitation 2.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ft Leonard Wood, MO (11 mi away); precipitation: Rolla 4.4 Wsw, MO (8 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.

654576b
Devils Elbow, MO · 6 mi
655296a
Jerome, MO · 6 mi
655846b
Saint Robert, MO · 10 mi
654016b
Rolla, MO · 10 mi
654096b
Rolla, MO · 12 mi
654616b
Duke, MO · 12 mi
654626b
Edgar Springs, MO · 12 mi
654026b
Rolla, MO · 12 mi

Missouri planting zones →

Questions about 65550

What planting zone is ZIP code 65550?

ZIP code 65550 (Newburg, 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 Newburg, MO?

The median last spring frost (32 °F) near 65550 is April 14; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ft Leonard Wood station.

When is the first frost in Newburg, MO?

The median first fall frost near 65550 is October 24, giving a median frost-free growing season of 193 days.

When should I plant tomatoes in 65550?

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 65550 get?

About 47.5 inches of precipitation a year (NOAA 1991–2020 normals, Rolla 4.4 Wsw station).

How hot do summers get in Newburg, MO?

The average high peaks at 88 °F in July, with about 35 days a year at 90 °F or more.

What kind of soil does 65550 have?

The USDA soil survey maps Razort at the center of ZIP 65550: silt loam, well drained, pH about 6.8 (neutral).

Did spring come early in Newburg, MO in 2026?

Spring leaf-out near 65550 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 Newburg, MO?

Intermediate onions: the longest day near 65550 is 14 h 47 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 65550 change?

Yes. The 2012 USDA map put 65550 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.