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

Planting zone for 83712 — Boise, ID

ZIP code 83712 (Boise, Ada County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 30 and the first fall frost October 22.

Where ZIP 83712 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 30
First frostOct 22
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 Boise, 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 Boise, ID

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 18only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Sep 30
Growing season173 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 9 and returns around November 1.

From the NOAA station Boise Lucky Peak Dam, ID — 7 miles away, elevation 2,841 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 83712

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10
GarlicPlant cloves · Oct 8 – Nov 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 22) 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 83712 came on Mar 23 — 17 days earlier than the 1991–2020 average (Apr 9).

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 Boise, ID.

Soil in Boise, ID

The soil mapped at the center of ZIP 83712 is Schiller — gravelly coarse sandy loam, somewhat excessively drained.

TextureGravelly coarse sandy loamdrains and warms fast; dries out and needs more feeding
pH6.7neutral; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter3%moderate
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Schiller-Shimo complex, 25 to 65 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 83712; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Boise, ID

Summer high93 °Faverage high, July
Winter low25 °Faverage low, December
Hot days60days a year at 90 °F or more
Freezing nights125nights a year at 32 °F or less
Growing degree days3,133base 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)
Precipitation15.7 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 26 °F 40°26° JanFebruary: average high 46 °F, low 27 °F 46°27° FebMarch: average high 56 °F, low 33 °F 56°33° MarApril: average high 63 °F, low 37 °F 63°37° AprMay: average high 74 °F, low 45 °F 74°45° MayJune: average high 82 °F, low 51 °F 82°51° JunJuly: average high 93 °F, low 59 °F 93°59° JulAugust: average high 91 °F, low 58 °F 91°58° AugSeptember: average high 81 °F, low 50 °F 81°50° SepOctober: average high 67 °F, low 41 °F 67°41° OctNovember: average high 50 °F, low 32 °F 50°32° NovDecember: average high 40 °F, low 25 °F 40°25° Dec

Precipitation by month inches

0″1″2″3″January: 1.83 in precipitation 1.8 JanFebruary: 1.49 in precipitation 1.5 FebMarch: 1.65 in precipitation 1.6 MarApril: 1.46 in precipitation 1.5 AprMay: 2.41 in precipitation 2.4 MayJune: 1.50 in precipitation 1.5 JunJuly: 0.27 in precipitation 0.3 JulAugust: 0.25 in precipitation 0.3 AugSeptember: 0.55 in precipitation 0.6 SepOctober: 0.95 in precipitation 0.9 OctNovember: 1.16 in precipitation 1.2 NovDecember: 2.18 in precipitation 2.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Boise Lucky Peak Dam, ID (7 mi away); precipitation: Boise 4.7 Ese, ID (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

837027a
Boise, ID · 4 mi
837247a
Boise, ID · 5 mi
837207a
Boise, ID · 5 mi
837067a
Boise, ID · 5 mi
837077a
Boise, ID · 6 mi
837287a
Boise, ID · 6 mi
837357a
Boise, ID · 6 mi
837997a
Boise, ID · 6 mi

All 26 ZIP codes in Boise → · Idaho planting zones →

Questions about 83712

What planting zone is ZIP code 83712?

ZIP code 83712 (Boise, 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 Boise, ID?

The median last spring frost (32 °F) near 83712 is April 30; after May 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Boise Lucky Peak Dam station.

When is the first frost in Boise, ID?

The median first fall frost near 83712 is October 22, giving a median frost-free growing season of 173 days.

When should I plant tomatoes in 83712?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 83712 get?

About 15.7 inches of precipitation a year (NOAA 1991–2020 normals, Boise 4.7 Ese station).

How hot do summers get in Boise, ID?

The average high peaks at 93 °F in July, with about 60 days a year at 90 °F or more.

What kind of soil does 83712 have?

The USDA soil survey maps Schiller at the center of ZIP 83712: gravelly coarse sandy loam, somewhat excessively drained, pH about 6.7 (neutral).

Did spring come early in Boise, ID in 2026?

Spring leaf-out near 83712 came on Mar 23 in 2026, 17 days earlier than the 1991–2020 average (Apr 9), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Boise, ID?

Long-day onions: the longest day near 83712 is 15 h 26 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).