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

Planting zone for 97833 — Haines, OR

ZIP code 97833 (Haines, Baker County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 25 and the first fall frost September 15.

Where ZIP 97833 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 frostMay 25

First frostSep 15

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 Haines, 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 Haines, OR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 25median — 50% chance of a later frost

Safe for tender plantsJune 16only 10% chance of frost after

First fall frostSeptember 15median — 10% chance by Sep 2

Growing season111 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 8 and returns around September 27.

From the NOAA station Baker City Municipal Airport, OR — 14 miles away, elevation 3,360 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 97833

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 13 – Apr 27

SpinachSow outdoors · Apr 13 – May 4

Broccoli, cabbageStart indoors · Mar 16 – Mar 30

Broccoli, cabbageTransplant · May 4 – May 18

Onion setsPlant outdoors · Apr 27 – May 11

PotatoesPlant outdoors · May 4 – May 18

LettuceSow outdoors · Apr 27 – May 11

Carrots, beetsSow outdoors · May 4 – May 18

TomatoesStart indoors · Mar 30 – Apr 13

TomatoesTransplant · Jun 1 – Jun 15

Peppers, eggplantStart indoors · Mar 16 – Mar 30

Peppers, eggplantTransplant · Jun 8 – Jun 22

BeansSow outdoors · Jun 1 – Jun 15

Sweet cornSow outdoors · Jun 1 – Jun 15

Cucumbers, squashSow outdoors · Jun 1 – Jun 15

Fall lettuce, spinachSow outdoors · Jul 21 – Aug 4

GarlicPlant cloves · Sep 1 – Oct 6

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 25) and first fall frost (Sep 15) 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 97833 came on Apr 4 — 18 days earlier than the 1991–2020 average (Apr 22).

average
Apr 222026
Apr 4

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 Haines, OR

The soil mapped at the center of ZIP 97833 is Kilmerque — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer

pH5.0strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter75%high

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Kilmerque loam, 12 to 35 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 97833; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Haines, OR

Summer high88 °Faverage high, July

Winter low20 °Faverage low, January

Hot days27days a year at 90 °F or more

Freezing nights191nights a year at 32 °F or less

Growing degree days1,993base 50 °F — the season’s usable heat

Longest day15 h 36 mindaylight on June 21

Shortest day8 h 46 mindaylight on December 21

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

Precipitation19.3 inper year, rain and melted snow

Snowfall79 inper year; 127 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: Baker City Municipal Airport, OR (14 mi away); precipitation: Rock Creek, OR (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

978676b

North Powder, OR · 11 mi

978146b

Baker City, OR · 17 mi

La Grande, OR · 26 mi

Oregon planting zones →

Questions about 97833

What planting zone is ZIP code 97833?

ZIP code 97833 (Haines, 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 Haines, OR?

The median last spring frost (32 °F) near 97833 is May 25; after June 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Baker City Municipal Airport station.

When is the first frost in Haines, OR?

The median first fall frost near 97833 is September 15, giving a median frost-free growing season of 111 days.

When should I plant tomatoes in 97833?

Start tomato seeds indoors around Mar 30 – Apr 13 and set transplants outside around Jun 1 – Jun 15, one to three weeks after the median last frost.

How much rain and snow does 97833 get?

About 19.3 inches of precipitation a year and 79 inches of snowfall (NOAA 1991–2020 normals, Rock Creek station).

How hot do summers get in Haines, OR?

The average high peaks at 88 °F in July, with about 27 days a year at 90 °F or more.

What kind of soil does 97833 have?

The USDA soil survey maps Kilmerque at the center of ZIP 97833: slightly decomposed plant material, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Haines, OR in 2026?

Spring leaf-out near 97833 came on Apr 4 in 2026, 18 days earlier than the 1991–2020 average (Apr 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Haines, OR?

Long-day onions: the longest day near 97833 is 15 h 36 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).