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

Planting zone for Boulder City, NV

Boulder City, NV is in USDA zone 9b across its 2 ZIP codes. The median last spring frost is January 21 and the first fall frost December 17.

Boulder City on the zone map

Outlined: its 1 ZIP code areas · 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.

Zone9b25 to 30 °F
ZIP codes2
Last frostJan 21
First frostDec 17
Growing season328 days

9b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Boulder City, NV

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJanuary 21median — 50% chance of a later frost
Safe for tender plantsMarch 5only 10% chance of frost after
First fall frostDecember 17median — 10% chance by Dec 2
Growing season328 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 10 and returns around December 30.

From the NOAA station Alan Bible Visitor Center, NV, elevation 1,641 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 Boulder City

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Dec 10 – Dec 24
SpinachSow outdoors · Dec 10 – Dec 31
Broccoli, cabbageStart indoors · Nov 12 – Nov 26
Broccoli, cabbageTransplant · Dec 31 – Jan 14
Onion setsPlant outdoors · Dec 24 – Jan 7
PotatoesPlant outdoors · Dec 31 – Jan 14
LettuceSow outdoors · Dec 24 – Jan 7
Carrots, beetsSow outdoors · Dec 31 – Jan 14
TomatoesStart indoors · Nov 26 – Dec 10
TomatoesTransplant · Jan 28 – Feb 11
Peppers, eggplantStart indoors · Nov 12 – Nov 26
Peppers, eggplantTransplant · Feb 4 – Feb 18
BeansSow outdoors · Jan 28 – Feb 11
Sweet cornSow outdoors · Jan 28 – Feb 11
Cucumbers, squashSow outdoors · Jan 28 – Feb 11
Fall lettuce, spinachSow outdoors · Oct 22 – Nov 5
GarlicPlant cloves · Dec 3 – Jan 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jan 21) and first fall frost (Dec 17) 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 89005 came on Jan 28 — about the same time as the 1991–2020 average (Jan 29).

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 9b in Nevada

544 plants native to the lower 48 states, recorded in Nevada, and rated by the USDA to survive 25 °F or colder — the bottom of zone 9b. Each links to its USDA PLANTS profile.

Trees 29

Arizona cypress50 ft · blooms spring · low shade tolerance · to −23 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FCalifornia red fir150 ft · blooms late spring · low shade tolerance · to −23 °FDouglas-fir200 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 112

alderleaf 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 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °Fbig saltbush10 ft · blooms early summer · high shade tolerance · to 7 °F

Wildflowers & perennials 256

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 137

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 timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °Farctic bluegrass2 ft · high shade tolerance · to −62 °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 Boulder City, NV.

Soil in Boulder City, NV

The soil mapped at the center of ZIP 89005 is Sunrock — extremely stony sandy loam, well drained.

TextureExtremely stony sandy loamdrains and warms fast; dries out and needs more feeding
pH8.2alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.25%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Sunrock-Haleburu-Rock outcrop association.

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 89005; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Boulder City, NV

Summer high107 °Faverage high, July
Winter low40 °Faverage low, December
Hot days147days a year at 90 °F or more
Freezing nights5nights a year at 32 °F or less
Growing degree days8,112base 50 °F — the season’s usable heat
Longest day14 h 36 mindaylight on June 21
Shortest day9 h 43 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation4.8 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°120°32 °FJanuary: average high 60 °F, low 41 °F 60°41° JanFebruary: average high 64 °F, low 45 °F 64°45° FebMarch: average high 73 °F, low 52 °F 73°52° MarApril: average high 81 °F, low 59 °F 81°59° AprMay: average high 91 °F, low 66 °F 91°66° MayJune: average high 103 °F, low 77 °F 103°77° JunJuly: average high 107 °F, low 84 °F 107°84° JulAugust: average high 105 °F, low 82 °F 105°82° AugSeptember: average high 98 °F, low 73 °F 98°73° SepOctober: average high 84 °F, low 59 °F 84°59° OctNovember: average high 69 °F, low 50 °F 69°50° NovDecember: average high 60 °F, low 40 °F 60°40° Dec

Precipitation by month inches

0″1″January: 0.63 in precipitation 0.6 JanFebruary: 0.93 in precipitation 0.9 FebMarch: 0.62 in precipitation 0.6 MarApril: 0.16 in precipitation 0.2 AprMay: 0.09 in precipitation 0.1 MayJune: 0.06 in precipitation 0.1 JunJuly: 0.34 in precipitation 0.3 JulAugust: 0.62 in precipitation 0.6 AugSeptember: 0.24 in precipitation 0.2 SepOctober: 0.37 in precipitation 0.4 OctNovember: 0.46 in precipitation 0.5 NovDecember: 0.32 in precipitation 0.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Alan Bible Visitor Center, NV (3 mi away); precipitation: Boulder City, NV (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Boulder City

890059b
25 to 30 °F
890069b
25 to 30 °F

Nevada planting zones →

Questions about Boulder City

What planting zone is Boulder City, NV?

Boulder City, NV is in USDA hardiness zone 9b on the 2023 map (9b: 25 to 30 °F).

When is the last frost in Boulder City, NV?

The median last spring frost is January 21 and the median first fall frost is December 17 (NOAA 1991–2020 normals, Alan Bible Visitor Center station).

When can I plant a garden in Boulder City, NV?

Cool-season crops like peas and spinach go in around Dec 10 – Dec 31; tomatoes, peppers, beans and squash after about Jan 28, once frost risk has passed.

What kind of onions grow in Boulder City, NV?

Intermediate onions: the longest day is 14 h 36 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

How much rain and snow does Boulder City, NV get?

About 4.8 inches of precipitation a year (NOAA 1991–2020 normals).