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

Planting zone for 83628 — Homedale, ID

ZIP code 83628 (Homedale, Owyhee County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 24 and the first fall frost October 9.

Where ZIP 83628 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 24

First frostOct 9

2012 zone6b

Was 6b on the 2012 map — half a zone warmer now. 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 Homedale, 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 Homedale, ID

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 24median — 50% chance of a later frost

Safe for tender plantsMay 5only 10% chance of frost after

First fall frostOctober 9median — 10% chance by Sep 26

Growing season169 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 10 and returns around October 22.

From the NOAA station Homedale 1 Se, ID — 3 miles away, elevation 2,231 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 83628

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 13 – Mar 27

SpinachSow outdoors · Mar 13 – Apr 3

Broccoli, cabbageStart indoors · Feb 13 – Feb 27

Broccoli, cabbageTransplant · Apr 3 – Apr 17

Onion setsPlant outdoors · Mar 27 – Apr 10

PotatoesPlant outdoors · Apr 3 – Apr 17

LettuceSow outdoors · Mar 27 – Apr 10

Carrots, beetsSow outdoors · Apr 3 – Apr 17

TomatoesStart indoors · Feb 27 – Mar 13

TomatoesTransplant · May 1 – May 15

Peppers, eggplantStart indoors · Feb 13 – Feb 27

Peppers, eggplantTransplant · May 8 – May 22

BeansSow outdoors · May 1 – May 15

Sweet cornSow outdoors · May 1 – May 15

Cucumbers, squashSow outdoors · May 1 – May 15

Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28

GarlicPlant cloves · Sep 25 – Oct 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 24) and first fall frost (Oct 9) 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 83628 came on Mar 5 — 15 days earlier than the 1991–2020 average (Mar 20).

average
Mar 202026
Mar 5

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.

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 Homedale, ID.

Soil in Homedale, ID

The soil mapped at the center of ZIP 83628 is Bahem — 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 groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Bahem silt loam, 0 to 1 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 83628; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Homedale, ID

Summer high92 °Faverage high, July

Winter low23 °Faverage low, January

Hot days65days a year at 90 °F or more

Freezing nights161nights a year at 32 °F or less

Growing degree days2,961base 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)

Precipitation10.1 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Homedale 1 Se, ID (3 mi away); precipitation: Homedale 1 Se, ID (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

Idaho planting zones →

Questions about 83628

What planting zone is ZIP code 83628?

ZIP code 83628 (Homedale, 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 Homedale, ID?

The median last spring frost (32 °F) near 83628 is April 24; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Homedale 1 Se station.

When is the first frost in Homedale, ID?

The median first fall frost near 83628 is October 9, giving a median frost-free growing season of 169 days.

When should I plant tomatoes in 83628?

Start tomato seeds indoors around Feb 27 – Mar 13 and set transplants outside around May 1 – May 15, one to three weeks after the median last frost.

How much rain and snow does 83628 get?

About 10.1 inches of precipitation a year (NOAA 1991–2020 normals, Homedale 1 Se station).

How hot do summers get in Homedale, ID?

The average high peaks at 92 °F in July, with about 65 days a year at 90 °F or more.

What kind of soil does 83628 have?

The USDA soil survey maps Bahem at the center of ZIP 83628: silt loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Homedale, ID in 2026?

Spring leaf-out near 83628 came on Mar 5 in 2026, 15 days earlier than the 1991–2020 average (Mar 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Homedale, ID?

Long-day onions: the longest day near 83628 is 15 h 26 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 83628 change?

Yes. The 2012 USDA map put 83628 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.