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

Planting zone for 80754 — Stoneham, CO

ZIP code 80754 (Stoneham, Weld County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 9 and the first fall frost October 4.

Where ZIP 80754 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 9
First frostOct 4
2012 zone5a

Was 5a 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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Stoneham, CO…

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 Stoneham, CO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 9median — 50% chance of a later frost
Safe for tender plantsMay 22only 10% chance of frost after
First fall frostOctober 4median — 10% chance by Sep 21
Growing season146 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 1 and returns around October 13.

From the NOAA station New Raymer, CO — 12 miles away, elevation 4,784 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 80754

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 28 – Apr 11
SpinachSow outdoors · Mar 28 – Apr 18
Broccoli, cabbageStart indoors · Feb 28 – Mar 14
Broccoli, cabbageTransplant · Apr 18 – May 2
Onion setsPlant outdoors · Apr 11 – Apr 25
PotatoesPlant outdoors · Apr 18 – May 2
LettuceSow outdoors · Apr 11 – Apr 25
Carrots, beetsSow outdoors · Apr 18 – May 2
TomatoesStart indoors · Mar 14 – Mar 28
TomatoesTransplant · May 16 – May 30
Peppers, eggplantStart indoors · Feb 28 – Mar 14
Peppers, eggplantTransplant · May 23 – Jun 6
BeansSow outdoors · May 16 – May 30
Sweet cornSow outdoors · May 16 – May 30
Cucumbers, squashSow outdoors · May 16 – May 30
Fall lettuce, spinachSow outdoors · Aug 9 – Aug 23
GarlicPlant cloves · Sep 20 – Oct 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 9) and first fall frost (Oct 4) 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 80754 came on Mar 1 — 29 days earlier than the 1991–2020 average (Mar 30).

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 5b in Colorado

546 plants native to the lower 48 states, recorded in Colorado, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 27

American elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblack walnut100 ft · blooms late spring · high shade tolerance · to −28 °Fblack willow100 ft · blooms early spring · high shade tolerance · to −58 °Fblue spruce100 ft · blooms late spring · medium shade tolerance · to −38 °F

Shrubs 98

alderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °F

Wildflowers & perennials 246

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine aster0.3 ft · blooms early summer · medium shade tolerance · to −28 °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 °F

Grasses 163

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 3

riverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °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 Stoneham, CO.

Soil in Stoneham, CO

The soil mapped at the center of ZIP 80754 is Cushman — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.2neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Cushman fine sandy loam, 6 to 9 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 80754; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Stoneham, CO

Summer high88 °Faverage high, July
Winter low14 °Faverage low, January
Hot days32days a year at 90 °F or more
Freezing nights176nights a year at 32 °F or less
Growing degree days2,648base 50 °F — the season’s usable heat
Longest day15 h 05 mindaylight on June 21
Shortest day9 h 15 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation16.2 inper year, rain and melted snow
Snowfall29 inper year; 35 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 14 °F 42°14° JanFebruary: average high 45 °F, low 15 °F 45°15° FebMarch: average high 54 °F, low 24 °F 54°24° MarApril: average high 61 °F, low 31 °F 61°31° AprMay: average high 70 °F, low 42 °F 70°42° MayJune: average high 80 °F, low 52 °F 80°52° JunJuly: average high 88 °F, low 58 °F 88°58° JulAugust: average high 87 °F, low 56 °F 87°56° AugSeptember: average high 78 °F, low 46 °F 78°46° SepOctober: average high 64 °F, low 34 °F 64°34° OctNovember: average high 51 °F, low 22 °F 51°22° NovDecember: average high 42 °F, low 15 °F 42°15° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 0.25 in precipitation, 4.6 in snowfall 0.3❄5 JanFebruary: 0.34 in precipitation, 4.3 in snowfall 0.3❄4 FebMarch: 0.96 in precipitation, 4.7 in snowfall 1.0❄5 MarApril: 1.49 in precipitation, 2.5 in snowfall 1.5❄3 AprMay: 2.56 in precipitation, 0.2 in snowfall 2.6 MayJune: 2.54 in precipitation 2.5 JunJuly: 2.43 in precipitation 2.4 JulAugust: 2.11 in precipitation 2.1 AugSeptember: 1.56 in precipitation, 0.9 in snowfall 1.6❄1 SepOctober: 1.11 in precipitation, 2.5 in snowfall 1.1❄3 OctNovember: 0.47 in precipitation, 5.8 in snowfall 0.5❄6 NovDecember: 0.40 in precipitation, 3.5 in snowfall 0.4❄4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: New Raymer, CO (12 mi away); precipitation: New Raymer, CO (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

807415b
Merino, CO · 11 mi
807425a
New Raymer, CO · 12 mi
807505b
Snyder, CO · 17 mi
807455b
Padroni, CO · 20 mi
807515b
Sterling, CO · 21 mi
807335b
Hillrose, CO · 23 mi
806535a
Weldona, CO · 23 mi
807225b
Atwood, CO · 26 mi

Colorado planting zones →

Questions about 80754

What planting zone is ZIP code 80754?

ZIP code 80754 (Stoneham, CO) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Stoneham, CO?

The median last spring frost (32 °F) near 80754 is May 9; after May 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, New Raymer station.

When is the first frost in Stoneham, CO?

The median first fall frost near 80754 is October 4, giving a median frost-free growing season of 146 days.

When should I plant tomatoes in 80754?

Start tomato seeds indoors around Mar 14 – Mar 28 and set transplants outside around May 16 – May 30, one to three weeks after the median last frost.

How much rain and snow does 80754 get?

About 16.2 inches of precipitation a year and 29 inches of snowfall (NOAA 1991–2020 normals, New Raymer station).

How hot do summers get in Stoneham, CO?

The average high peaks at 88 °F in July, with about 32 days a year at 90 °F or more.

What kind of soil does 80754 have?

The USDA soil survey maps Cushman at the center of ZIP 80754: fine sandy loam, well drained, pH about 7.2 (neutral).

Did spring come early in Stoneham, CO in 2026?

Spring leaf-out near 80754 came on Mar 1 in 2026, 29 days earlier than the 1991–2020 average (Mar 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Stoneham, CO?

Long-day onions: the longest day near 80754 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 80754 change?

Yes. The 2012 USDA map put 80754 in zone 5a; the 2023 map puts it in zone 5b. The newer map uses 1991–2020 data and more weather stations.