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

Planting zone for 97752 — Post, OR

ZIP code 97752 (Post, Crook County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is June 2 and the first fall frost September 17.

Where ZIP 97752 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 frostJun 2

First frostSep 17

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 Post, OR…

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 Post, OR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostJune 2median — 50% chance of a later frost

Safe for tender plantsJune 25only 10% chance of frost after

First fall frostSeptember 17median — 10% chance by Aug 30

Growing season104 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 12 and returns around September 30.

From the NOAA station Barnes Stn, OR — 13 miles away, elevation 3,970 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 97752

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 21 – May 5

SpinachSow outdoors · Apr 21 – May 12

Broccoli, cabbageStart indoors · Mar 24 – Apr 7

Broccoli, cabbageTransplant · May 12 – May 26

Onion setsPlant outdoors · May 5 – May 19

PotatoesPlant outdoors · May 12 – May 26

LettuceSow outdoors · May 5 – May 19

Carrots, beetsSow outdoors · May 12 – May 26

TomatoesStart indoors · Apr 7 – Apr 21

TomatoesTransplant · Jun 9 – Jun 23

Peppers, eggplantStart indoors · Mar 24 – Apr 7

Peppers, eggplantTransplant · Jun 16 – Jun 30

BeansSow outdoors · Jun 9 – Jun 23

Sweet cornSow outdoors · Jun 9 – Jun 23

Cucumbers, squashSow outdoors · Jun 9 – Jun 23

Fall lettuce, spinachSow outdoors · Jul 23 – Aug 6

GarlicPlant cloves · Sep 3 – Oct 8

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 2) and first fall frost (Sep 17) 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 97752 came on Mar 16 — 19 days earlier than the 1991–2020 average (Apr 4).

average
Apr 42026
Mar 16

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 6a in Oregon

607 plants native to the lower 48 states, recorded in Oregon, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. 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 Post, OR.

Soil in Post, OR

The soil mapped at the center of ZIP 97752 is Barbermill — cobbly loam, well drained.

TextureCobbly loama good balance for most vegetables

pH7.0neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Barbermill-Brisbois-Sorf complex, 15 to 55 percent south 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 97752; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Post, OR

Summer high89 °Faverage high, July

Winter low18 °Faverage low, December

Hot days35days a year at 90 °F or more

Freezing nights214nights a year at 32 °F or less

Growing degree days1,627base 50 °F — the season’s usable heat

Longest day15 h 30 mindaylight on June 21

Shortest day8 h 52 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation12.5 inper year, rain and melted snow

Snowfall31 inper year; 39 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Paulina, OR (10 mi away); precipitation: Barnes Stn, OR (13 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

977546b

Prineville, OR · 16 mi

Powell Butte, OR · 39 mi

Oregon planting zones →

Questions about 97752

What planting zone is ZIP code 97752?

ZIP code 97752 (Post, OR) 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 Post, OR?

The median last spring frost (32 °F) near 97752 is June 2; after June 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Barnes Stn station.

When is the first frost in Post, OR?

The median first fall frost near 97752 is September 17, giving a median frost-free growing season of 104 days.

When should I plant tomatoes in 97752?

Start tomato seeds indoors around Apr 7 – Apr 21 and set transplants outside around Jun 9 – Jun 23, one to three weeks after the median last frost.

How much rain and snow does 97752 get?

About 12.5 inches of precipitation a year and 31 inches of snowfall (NOAA 1991–2020 normals, Barnes Stn station).

How hot do summers get in Post, OR?

The average high peaks at 89 °F in July, with about 35 days a year at 90 °F or more.

What kind of soil does 97752 have?

The USDA soil survey maps Barbermill at the center of ZIP 97752: cobbly loam, well drained, pH about 7.0 (neutral).

Did spring come early in Post, OR in 2026?

Spring leaf-out near 97752 came on Mar 16 in 2026, 19 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Post, OR?

Long-day onions: the longest day near 97752 is 15 h 30 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).