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

Planting zone for 80135 — Sedalia, CO

ZIP code 80135 (Sedalia, Douglas County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 17 and the first fall frost October 1.

Where ZIP 80135 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 17
First frostOct 1
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 Sedalia, 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 Sedalia, CO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 17median — 50% chance of a later frost
Safe for tender plantsJune 6only 10% chance of frost after
First fall frostOctober 1median — 10% chance by Sep 19
Growing season135 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 6 and returns around October 10.

From the NOAA station Cheesman, CO — 7 miles away, elevation 6,880 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 80135

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 5 – Apr 19
SpinachSow outdoors · Apr 5 – Apr 26
Broccoli, cabbageStart indoors · Mar 8 – Mar 22
Broccoli, cabbageTransplant · Apr 26 – May 10
Onion setsPlant outdoors · Apr 19 – May 3
PotatoesPlant outdoors · Apr 26 – May 10
LettuceSow outdoors · Apr 19 – May 3
Carrots, beetsSow outdoors · Apr 26 – May 10
TomatoesStart indoors · Mar 22 – Apr 5
TomatoesTransplant · May 24 – Jun 7
Peppers, eggplantStart indoors · Mar 8 – Mar 22
Peppers, eggplantTransplant · May 31 – Jun 14
BeansSow outdoors · May 24 – Jun 7
Sweet cornSow outdoors · May 24 – Jun 7
Cucumbers, squashSow outdoors · May 24 – Jun 7
Fall lettuce, spinachSow outdoors · Aug 6 – Aug 20
GarlicPlant cloves · Sep 17 – Oct 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 17) and first fall frost (Oct 1) 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 80135 came on Mar 17 — 25 days earlier than the 1991–2020 average (Apr 11).

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 Sedalia, CO.

Soil in Sedalia, CO

The soil mapped at the center of ZIP 80135 is Sphinx — slightly decomposed plant material, somewhat excessively drained.

TextureSlightly decomposed plant materialtop layer
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter85%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Sphinx gravelly coarse sandy loam, 40 to 70 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 80135; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Sedalia, CO

Summer high84 °Faverage high, July
Winter low14 °Faverage low, January
Hot days11days a year at 90 °F or more
Freezing nights210nights a year at 32 °F or less
Growing degree days2,044base 50 °F — the season’s usable heat
Longest day14 h 56 mindaylight on June 21
Shortest day9 h 24 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation15.8 inper year, rain and melted snow
Snowfall59 inper year; 49 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 45 °F, low 14 °F 45°14° JanFebruary: average high 46 °F, low 16 °F 46°16° FebMarch: average high 53 °F, low 23 °F 53°23° MarApril: average high 58 °F, low 29 °F 58°29° AprMay: average high 67 °F, low 38 °F 67°38° MayJune: average high 79 °F, low 47 °F 79°47° JunJuly: average high 84 °F, low 53 °F 84°53° JulAugust: average high 82 °F, low 51 °F 82°51° AugSeptember: average high 76 °F, low 43 °F 76°43° SepOctober: average high 64 °F, low 32 °F 64°32° OctNovember: average high 53 °F, low 23 °F 53°23° NovDecember: average high 44 °F, low 15 °F 44°15° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 0.51 in precipitation, 7 in snowfall 0.5❄7 JanFebruary: 0.55 in precipitation, 7.4 in snowfall 0.6❄7 FebMarch: 1.21 in precipitation, 11.2 in snowfall 1.2❄11 MarApril: 1.52 in precipitation, 10.3 in snowfall 1.5❄10 AprMay: 1.78 in precipitation, 1.9 in snowfall 1.8❄2 MayJune: 1.68 in precipitation 1.7 JunJuly: 2.60 in precipitation 2.6 JulAugust: 2.56 in precipitation 2.6 AugSeptember: 1.24 in precipitation, 0.5 in snowfall 1.2❄1 SepOctober: 1.00 in precipitation, 5.7 in snowfall 1.0❄6 OctNovember: 0.61 in precipitation, 7 in snowfall 0.6❄7 NovDecember: 0.52 in precipitation, 8.2 in snowfall 0.5❄8 Dec

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

Nearby ZIP codes

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

804255b
Buffalo Creek, CO · 7 mi
801636a
Littleton, CO · 11 mi
804705b
Pine, CO · 12 mi
801185b
Larkspur, CO · 15 mi
801095b
Castle Rock, CO · 15 mi
808635b
Woodland Park, CO · 16 mi
801255b
Littleton, CO · 17 mi
801335b
Palmer Lake, CO · 17 mi

Colorado planting zones →

Questions about 80135

What planting zone is ZIP code 80135?

ZIP code 80135 (Sedalia, 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 Sedalia, CO?

The median last spring frost (32 °F) near 80135 is May 17; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cheesman station.

When is the first frost in Sedalia, CO?

The median first fall frost near 80135 is October 1, giving a median frost-free growing season of 135 days.

When should I plant tomatoes in 80135?

Start tomato seeds indoors around Mar 22 – Apr 5 and set transplants outside around May 24 – Jun 7, one to three weeks after the median last frost.

How much rain and snow does 80135 get?

About 15.8 inches of precipitation a year and 59 inches of snowfall (NOAA 1991–2020 normals, Cheesman station).

How hot do summers get in Sedalia, CO?

The average high peaks at 84 °F in July, with about 11 days a year at 90 °F or more.

What kind of soil does 80135 have?

The USDA soil survey maps Sphinx at the center of ZIP 80135: slightly decomposed plant material, somewhat excessively drained, pH about 5.6 (moderately acidic).

Did spring come early in Sedalia, CO in 2026?

Spring leaf-out near 80135 came on Mar 17 in 2026, 25 days earlier than the 1991–2020 average (Apr 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Sedalia, CO?

Intermediate onions: the longest day near 80135 is 14 h 56 min, so day-neutral types bulb best; long-day varieties may not bulb fully.