Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 74850 — Lamar, OK

ZIP code 74850 (Lamar, Hughes County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is March 29 and the first fall frost November 5.

Where ZIP 74850 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostMar 29

First frostNov 5

2012 zone7b

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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Lamar, OK…

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 Lamar, OK

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMarch 29median — 50% chance of a later frost

Safe for tender plantsApril 14only 10% chance of frost after

First fall frostNovember 5median — 10% chance by Oct 21

Growing season221 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 15 and returns around November 16.

From the NOAA station Holdenville 3ese Mesonet, OK — 14 miles away, elevation 919 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 74850

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 15 – Mar 1

SpinachSow outdoors · Feb 15 – Mar 8

Broccoli, cabbageStart indoors · Jan 18 – Feb 1

Broccoli, cabbageTransplant · Mar 8 – Mar 22

Onion setsPlant outdoors · Mar 1 – Mar 15

PotatoesPlant outdoors · Mar 8 – Mar 22

LettuceSow outdoors · Mar 1 – Mar 15

Carrots, beetsSow outdoors · Mar 8 – Mar 22

TomatoesStart indoors · Feb 1 – Feb 15

TomatoesTransplant · Apr 5 – Apr 19

Peppers, eggplantStart indoors · Jan 18 – Feb 1

Peppers, eggplantTransplant · Apr 12 – Apr 26

BeansSow outdoors · Apr 5 – Apr 19

Sweet cornSow outdoors · Apr 5 – Apr 19

Cucumbers, squashSow outdoors · Apr 5 – Apr 19

Fall lettuce, spinachSow outdoors · Sep 10 – Sep 24

GarlicPlant cloves · Oct 22 – Nov 26

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 29) and first fall frost (Nov 5) 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 74850 came on Feb 12 — 8 days earlier than the 1991–2020 average (Feb 20).

average
Feb 202026
Feb 12

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 7b in Oklahoma

518 plants native to the lower 48 states, recorded in Oklahoma, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

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 Lamar, OK.

Soil in Lamar, OK

The soil mapped at the center of ZIP 74850 is Hector — stony fine sandy loam, well drained.

TextureStony fine sandy loamdrains and warms fast; dries out and needs more feeding

pH5.8moderately acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Hector-Endsaw complex, 5 to 30 percent slopes, stony.

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 74850; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Lamar, OK

Summer high92 °Faverage high, August

Winter low30 °Faverage low, January

Hot days67days a year at 90 °F or more

Freezing nights66nights a year at 32 °F or less

Growing degree days5,183base 50 °F — the season’s usable heat

Longest day14 h 31 mindaylight on June 21

Shortest day9 h 47 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation45.4 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Holdenville 3ese Mesonet, OK (14 mi away); precipitation: Wetumka 3 Ne, OK (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

Holdenville, OK · 14 mi

748457b

Hanna, OK · 16 mi

744427b

Indianola, OK · 16 mi

Oklahoma planting zones →

Questions about 74850

What planting zone is ZIP code 74850?

ZIP code 74850 (Lamar, OK) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Lamar, OK?

The median last spring frost (32 °F) near 74850 is March 29; after April 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Holdenville 3ese Mesonet station.

When is the first frost in Lamar, OK?

The median first fall frost near 74850 is November 5, giving a median frost-free growing season of 221 days.

When should I plant tomatoes in 74850?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 74850 get?

About 45.4 inches of precipitation a year (NOAA 1991–2020 normals, Wetumka 3 Ne station).

How hot do summers get in Lamar, OK?

The average high peaks at 92 °F in August, with about 67 days a year at 90 °F or more.

What kind of soil does 74850 have?

The USDA soil survey maps Hector at the center of ZIP 74850: stony fine sandy loam, well drained, pH about 5.8 (moderately acidic).

Did spring come early in Lamar, OK in 2026?

Spring leaf-out near 74850 came on Feb 12 in 2026, 8 days earlier than the 1991–2020 average (Feb 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Lamar, OK?

Intermediate onions: the longest day near 74850 is 14 h 31 min, so day-neutral types bulb best; long-day varieties may not bulb fully.