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

Planting zone for 81034 — Crowley, CO

ZIP code 81034 (Crowley, Crowley County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 2 and the first fall frost October 8.

Where ZIP 81034 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 2
First frostOct 8
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Crowley, 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 Crowley, CO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 2median — 50% chance of a later frost
Safe for tender plantsMay 14only 10% chance of frost after
First fall frostOctober 8median — 10% chance by Sep 25
Growing season159 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 23 and returns around October 16.

From the NOAA station Ordway 1 Ene, CO — 7 miles away, elevation 4,311 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 81034

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 21 – Apr 4
SpinachSow outdoors · Mar 21 – Apr 11
Broccoli, cabbageStart indoors · Feb 21 – Mar 7
Broccoli, cabbageTransplant · Apr 11 – Apr 25
Onion setsPlant outdoors · Apr 4 – Apr 18
PotatoesPlant outdoors · Apr 11 – Apr 25
LettuceSow outdoors · Apr 4 – Apr 18
Carrots, beetsSow outdoors · Apr 11 – Apr 25
TomatoesStart indoors · Mar 7 – Mar 21
TomatoesTransplant · May 9 – May 23
Peppers, eggplantStart indoors · Feb 21 – Mar 7
Peppers, eggplantTransplant · May 16 – May 30
BeansSow outdoors · May 9 – May 23
Sweet cornSow outdoors · May 9 – May 23
Cucumbers, squashSow outdoors · May 9 – May 23
Fall lettuce, spinachSow outdoors · Aug 13 – Aug 27
GarlicPlant cloves · Sep 24 – Oct 29
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 2) and first fall frost (Oct 8) 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 81034 came on Feb 23 — 21 days earlier than the 1991–2020 average (Mar 16).

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 Crowley, CO.

Soil in Crowley, CO

The soil mapped at the center of ZIP 81034 is Vonid — sandy loam, somewhat excessively drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH7.2neutral; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Vonid sandy loam, 0 to 5 percent slopes, dry.

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 81034; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Crowley, CO

Summer high94 °Faverage high, July
Winter low12 °Faverage low, January
Hot days86days a year at 90 °F or more
Freezing nights173nights a year at 32 °F or less
Growing degree days3,440base 50 °F — the season’s usable heat
Longest day14 h 49 mindaylight on June 21
Shortest day9 h 30 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation11.7 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 45 °F, low 12 °F 45°12° JanFebruary: average high 48 °F, low 17 °F 48°17° FebMarch: average high 60 °F, low 25 °F 60°25° MarApril: average high 67 °F, low 34 °F 67°34° AprMay: average high 77 °F, low 45 °F 77°45° MayJune: average high 89 °F, low 55 °F 89°55° JunJuly: average high 94 °F, low 61 °F 94°61° JulAugust: average high 91 °F, low 59 °F 91°59° AugSeptember: average high 83 °F, low 49 °F 83°49° SepOctober: average high 70 °F, low 34 °F 70°34° OctNovember: average high 56 °F, low 22 °F 56°22° NovDecember: average high 45 °F, low 13 °F 45°13° Dec

Precipitation by month inches

0″1″2″January: 0.25 in precipitation 0.3 JanFebruary: 0.28 in precipitation 0.3 FebMarch: 0.69 in precipitation 0.7 MarApril: 1.16 in precipitation 1.2 AprMay: 1.56 in precipitation 1.6 MayJune: 1.58 in precipitation 1.6 JunJuly: 1.84 in precipitation 1.8 JulAugust: 1.95 in precipitation 1.9 AugSeptember: 0.81 in precipitation 0.8 SepOctober: 0.93 in precipitation 0.9 OctNovember: 0.34 in precipitation 0.3 NovDecember: 0.29 in precipitation 0.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ordway 1 Ene, CO (7 mi away); precipitation: Ordway 1.3 E, CO (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

810586a
Manzanola, CO · 6 mi
810626a
Olney Springs, CO · 9 mi
810676a
Rocky Ford, CO · 14 mi
810635b
Ordway, CO · 17 mi
810765b
Sugar City, CO · 17 mi
810776a
Swink, CO · 18 mi
810306a
Cheraw, CO · 20 mi
810396a
Fowler, CO · 22 mi

Colorado planting zones →

Questions about 81034

What planting zone is ZIP code 81034?

ZIP code 81034 (Crowley, 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 Crowley, CO?

The median last spring frost (32 °F) near 81034 is May 2; after May 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ordway 1 Ene station.

When is the first frost in Crowley, CO?

The median first fall frost near 81034 is October 8, giving a median frost-free growing season of 159 days.

When should I plant tomatoes in 81034?

Start tomato seeds indoors around Mar 7 – Mar 21 and set transplants outside around May 9 – May 23, one to three weeks after the median last frost.

How much rain and snow does 81034 get?

About 11.7 inches of precipitation a year (NOAA 1991–2020 normals, Ordway 1.3 E station).

How hot do summers get in Crowley, CO?

The average high peaks at 94 °F in July, with about 86 days a year at 90 °F or more.

What kind of soil does 81034 have?

The USDA soil survey maps Vonid at the center of ZIP 81034: sandy loam, somewhat excessively drained, pH about 7.2 (neutral).

Did spring come early in Crowley, CO in 2026?

Spring leaf-out near 81034 came on Feb 23 in 2026, 21 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Crowley, CO?

Intermediate onions: the longest day near 81034 is 14 h 49 min, so day-neutral types bulb best; long-day varieties may not bulb fully.