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

Planting zone for 99356 — Roosevelt, WA

ZIP code 99356 (Roosevelt, Klickitat County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 6 and the first fall frost October 21.

Where ZIP 99356 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 6
First frostOct 21
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Roosevelt, WA…

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 Roosevelt, WA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 6median — 50% chance of a later frost
Safe for tender plantsApril 28only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 6
Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 19 and returns around November 3.

From the NOAA station Arlington, OR — 11 miles away, elevation 276 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 99356

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 23 – Mar 9
SpinachSow outdoors · Feb 23 – Mar 16
Broccoli, cabbageStart indoors · Jan 26 – Feb 9
Broccoli, cabbageTransplant · Mar 16 – Mar 30
Onion setsPlant outdoors · Mar 9 – Mar 23
PotatoesPlant outdoors · Mar 16 – Mar 30
LettuceSow outdoors · Mar 9 – Mar 23
Carrots, beetsSow outdoors · Mar 16 – Mar 30
TomatoesStart indoors · Feb 9 – Feb 23
TomatoesTransplant · Apr 13 – Apr 27
Peppers, eggplantStart indoors · Jan 26 – Feb 9
Peppers, eggplantTransplant · Apr 20 – May 4
BeansSow outdoors · Apr 13 – Apr 27
Sweet cornSow outdoors · Apr 13 – Apr 27
Cucumbers, squashSow outdoors · Apr 13 – Apr 27
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 6) 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 99356 came on Mar 20 — 11 days earlier than the 1991–2020 average (Mar 31).

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 7a in Washington

590 plants native to the lower 48 states, recorded in Washington, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 31

Alaska cedar75 ft · blooms mid spring · low shade tolerance · to −22 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigleaf maple60 ft · blooms mid spring · medium shade tolerance · to −14 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °F

Shrubs 105

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FBarclay's willow15 ft · high shade tolerance · to −43 °F

Wildflowers & perennials 282

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 157

Alaska brome5 ft · blooms late spring · low shade tolerance · to −18 °FAlaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °F

Vines 3

riverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

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 Roosevelt, WA.

Soil in Roosevelt, WA

The soil mapped at the center of ZIP 99356 is Van Nostern — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.7neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Van Nostern silt loam, 2 to 5 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 99356; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Roosevelt, WA

Summer high90 °Faverage high, July
Winter low30 °Faverage low, January
Hot days46days a year at 90 °F or more
Freezing nights73nights a year at 32 °F or less
Growing degree days3,323base 50 °F — the season’s usable heat
Longest day15 h 44 mindaylight on June 21
Shortest day8 h 40 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation9.3 inper year, rain and melted snow
Snowfall5 inper year; 7 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 41 °F, low 30 °F 41°30° JanFebruary: average high 47 °F, low 31 °F 47°31° FebMarch: average high 56 °F, low 36 °F 56°36° MarApril: average high 64 °F, low 42 °F 64°42° AprMay: average high 73 °F, low 50 °F 73°50° MayJune: average high 80 °F, low 57 °F 80°57° JunJuly: average high 90 °F, low 63 °F 90°63° JulAugust: average high 89 °F, low 62 °F 89°62° AugSeptember: average high 80 °F, low 53 °F 80°53° SepOctober: average high 66 °F, low 42 °F 66°42° OctNovember: average high 50 °F, low 34 °F 50°34° NovDecember: average high 41 °F, low 30 °F 41°30° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 1.47 in precipitation, 2 in snowfall 1.5❄2 JanFebruary: 0.98 in precipitation, 1.2 in snowfall 1.0❄1 FebMarch: 0.83 in precipitation, 0.2 in snowfall 0.8 MarApril: 0.61 in precipitation 0.6 AprMay: 0.75 in precipitation 0.8 MayJune: 0.48 in precipitation 0.5 JunJuly: 0.10 in precipitation 0.1 JulAugust: 0.15 in precipitation 0.1 AugSeptember: 0.33 in precipitation 0.3 SepOctober: 0.81 in precipitation, 0.1 in snowfall 0.8 OctNovember: 1.13 in precipitation, 0.4 in snowfall 1.1 NovDecember: 1.66 in precipitation, 1.4 in snowfall 1.7❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Arlington, OR (11 mi away); precipitation: Arlington, OR (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

993227b
Bickleton, WA · 13 mi
978127b
Arlington, OR · 18 mi
986207a
Goldendale, WA · 20 mi
970657b
Wasco, OR · 21 mi
970508a
Rufus, OR · 23 mi
989357a
Mabton, WA · 25 mi
970397a
Moro, OR · 28 mi
978617b
Mikkalo, OR · 28 mi

Washington planting zones →

Questions about 99356

What planting zone is ZIP code 99356?

ZIP code 99356 (Roosevelt, WA) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Roosevelt, WA?

The median last spring frost (32 °F) near 99356 is April 6; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Arlington station.

When is the first frost in Roosevelt, WA?

The median first fall frost near 99356 is October 21, giving a median frost-free growing season of 196 days.

When should I plant tomatoes in 99356?

Start tomato seeds indoors around Feb 9 – Feb 23 and set transplants outside around Apr 13 – Apr 27, one to three weeks after the median last frost.

How much rain and snow does 99356 get?

About 9.3 inches of precipitation a year and 5 inches of snowfall (NOAA 1991–2020 normals, Arlington station).

How hot do summers get in Roosevelt, WA?

The average high peaks at 90 °F in July, with about 46 days a year at 90 °F or more.

What kind of soil does 99356 have?

The USDA soil survey maps Van Nostern at the center of ZIP 99356: silt loam, well drained, pH about 6.7 (neutral).

Did spring come early in Roosevelt, WA in 2026?

Spring leaf-out near 99356 came on Mar 20 in 2026, 11 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Roosevelt, WA?

Long-day onions: the longest day near 99356 is 15 h 44 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).