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

Planting zone for 83630 — Huston, ID

ZIP code 83630 (Huston, Canyon County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 23 and the first fall frost October 18.

Where ZIP 83630 is

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 23
First frostOct 18
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 Huston, ID…

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 Huston, ID

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 23median — 50% chance of a later frost
Safe for tender plantsMay 9only 10% chance of frost after
First fall frostOctober 18median — 10% chance by Oct 2
Growing season178 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around October 30.

From the NOAA station Deer Flat Dam, ID — 3 miles away, elevation 2,510 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 83630

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 12 – Mar 26
SpinachSow outdoors · Mar 12 – Apr 2
Broccoli, cabbageStart indoors · Feb 12 – Feb 26
Broccoli, cabbageTransplant · Apr 2 – Apr 16
Onion setsPlant outdoors · Mar 26 – Apr 9
PotatoesPlant outdoors · Apr 2 – Apr 16
LettuceSow outdoors · Mar 26 – Apr 9
Carrots, beetsSow outdoors · Apr 2 – Apr 16
TomatoesStart indoors · Feb 26 – Mar 12
TomatoesTransplant · Apr 30 – May 14
Peppers, eggplantStart indoors · Feb 12 – Feb 26
Peppers, eggplantTransplant · May 7 – May 21
BeansSow outdoors · Apr 30 – May 14
Sweet cornSow outdoors · Apr 30 – May 14
Cucumbers, squashSow outdoors · Apr 30 – May 14
Fall lettuce, spinachSow outdoors · Aug 23 – Sep 6
GarlicPlant cloves · Oct 4 – Nov 8
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 18) 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 83630 came on Mar 8 — 11 days earlier than the 1991–2020 average (Mar 19).

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 Idaho

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

Trees 30

balsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblue spruce100 ft · blooms late spring · medium shade tolerance · to −38 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FDouglas-fir200 ft · blooms mid spring · medium shade tolerance · to −33 °FEngelmann spruce120 ft · blooms late spring · low shade tolerance · to −50 °F

Shrubs 101

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FBarclay's willow15 ft · high shade tolerance · to −43 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °F

Wildflowers & perennials 277

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 155

Alaska 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 Meadow-Foxtail0.5 ft · blooms mid spring · medium shade tolerance · to −33 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °F

Vines 1

western 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 Huston, ID.

Soil in Huston, ID

The soil mapped at the center of ZIP 83630 is Minidoka — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Minidoka silt loam, 1 to 3 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 83630; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Huston, ID

Summer high90 °Faverage high, July
Winter low24 °Faverage low, December
Hot days41days a year at 90 °F or more
Freezing nights106nights a year at 32 °F or less
Growing degree days2,992base 50 °F — the season’s usable heat
Longest day15 h 26 mindaylight on June 21
Shortest day8 h 56 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation10 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 40 °F, low 25 °F 40°25° JanFebruary: average high 47 °F, low 27 °F 47°27° FebMarch: average high 58 °F, low 34 °F 58°34° MarApril: average high 65 °F, low 38 °F 65°38° AprMay: average high 73 °F, low 46 °F 73°46° MayJune: average high 81 °F, low 52 °F 81°52° JunJuly: average high 90 °F, low 59 °F 90°59° JulAugust: average high 89 °F, low 57 °F 89°57° AugSeptember: average high 80 °F, low 49 °F 80°49° SepOctober: average high 66 °F, low 39 °F 66°39° OctNovember: average high 50 °F, low 31 °F 50°31° NovDecember: average high 40 °F, low 24 °F 40°24° Dec

Precipitation by month inches

0″1″2″January: 1.22 in precipitation 1.2 JanFebruary: 0.99 in precipitation 1.0 FebMarch: 1.10 in precipitation 1.1 MarApril: 1.06 in precipitation 1.1 AprMay: 1.15 in precipitation 1.1 MayJune: 0.70 in precipitation 0.7 JunJuly: 0.29 in precipitation 0.3 JulAugust: 0.19 in precipitation 0.2 AugSeptember: 0.37 in precipitation 0.4 SepOctober: 0.75 in precipitation 0.8 OctNovember: 1.07 in precipitation 1.1 NovDecember: 1.11 in precipitation 1.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Deer Flat Dam, ID (3 mi away); precipitation: Deer Flat Dam, ID (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

836537a
Nampa, ID · 2 mi
836267a
Greenleaf, ID · 5 mi
836767a
Wilder, ID · 7 mi
836077a
Caldwell, ID · 8 mi
836057a
Caldwell, ID · 8 mi
836517a
Nampa, ID · 8 mi
836567a
Notus, ID · 8 mi
836067a
Caldwell, ID · 8 mi

Idaho planting zones →

Questions about 83630

What planting zone is ZIP code 83630?

ZIP code 83630 (Huston, ID) 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 Huston, ID?

The median last spring frost (32 °F) near 83630 is April 23; after May 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Deer Flat Dam station.

When is the first frost in Huston, ID?

The median first fall frost near 83630 is October 18, giving a median frost-free growing season of 178 days.

When should I plant tomatoes in 83630?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 83630 get?

About 10 inches of precipitation a year (NOAA 1991–2020 normals, Deer Flat Dam station).

How hot do summers get in Huston, ID?

The average high peaks at 90 °F in July, with about 41 days a year at 90 °F or more.

What kind of soil does 83630 have?

The USDA soil survey maps Minidoka at the center of ZIP 83630: silt loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Huston, ID in 2026?

Spring leaf-out near 83630 came on Mar 8 in 2026, 11 days earlier than the 1991–2020 average (Mar 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Huston, ID?

Long-day onions: the longest day near 83630 is 15 h 26 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).