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

Planting zone for 80723 — Brush, CO

ZIP code 80723 (Brush, Morgan County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 15 and the first fall frost October 1.

Where ZIP 80723 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 15
First frostOct 1
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 Brush, 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 Brush, CO

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 15median — 50% chance of a later frost
Safe for tender plantsMay 28only 10% chance of frost after
First fall frostOctober 1median — 10% chance by Sep 21
Growing season140 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 5 and returns around October 9.

From the NOAA station Woodrow 6nne, CO — 8 miles away, elevation 4,374 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 80723

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 3 – Apr 17
SpinachSow outdoors · Apr 3 – Apr 24
Broccoli, cabbageStart indoors · Mar 6 – Mar 20
Broccoli, cabbageTransplant · Apr 24 – May 8
Onion setsPlant outdoors · Apr 17 – May 1
PotatoesPlant outdoors · Apr 24 – May 8
LettuceSow outdoors · Apr 17 – May 1
Carrots, beetsSow outdoors · Apr 24 – May 8
TomatoesStart indoors · Mar 20 – Apr 3
TomatoesTransplant · May 22 – Jun 5
Peppers, eggplantStart indoors · Mar 6 – Mar 20
Peppers, eggplantTransplant · May 29 – Jun 12
BeansSow outdoors · May 22 – Jun 5
Sweet cornSow outdoors · May 22 – Jun 5
Cucumbers, squashSow outdoors · May 22 – Jun 5
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 15) 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 80723 came on Mar 1 — 26 days earlier than the 1991–2020 average (Mar 27).

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 Brush, CO.

Soil in Brush, CO

The soil mapped at the center of ZIP 80723 is Valent — sand, excessively drained.

TextureSanddrains and warms fast; dries out and needs more feeding
pH6.6neutral; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter0.9%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Valent sand, 0 to 3 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 80723; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Brush, CO

Summer high91 °Faverage high, July
Winter low9 °Faverage low, January
Hot days65days a year at 90 °F or more
Freezing nights192nights a year at 32 °F or less
Growing degree days2,737base 50 °F — the season’s usable heat
Longest day15 h 02 mindaylight on June 21
Shortest day9 h 18 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation16.3 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 42 °F, low 9 °F 42°9° JanFebruary: average high 45 °F, low 13 °F 45°13° FebMarch: average high 55 °F, low 21 °F 55°21° MarApril: average high 63 °F, low 29 °F 63°29° AprMay: average high 72 °F, low 39 °F 72°39° MayJune: average high 84 °F, low 50 °F 84°50° JunJuly: average high 91 °F, low 57 °F 91°57° JulAugust: average high 89 °F, low 54 °F 89°54° AugSeptember: average high 81 °F, low 45 °F 81°45° SepOctober: average high 66 °F, low 31 °F 66°31° OctNovember: average high 53 °F, low 19 °F 53°19° NovDecember: average high 42 °F, low 9 °F 42°9° Dec

Precipitation by month inches

0″1″2″3″January: 0.35 in precipitation 0.3 JanFebruary: 0.41 in precipitation 0.4 FebMarch: 0.77 in precipitation 0.8 MarApril: 1.61 in precipitation 1.6 AprMay: 2.72 in precipitation 2.7 MayJune: 2.37 in precipitation 2.4 JunJuly: 2.59 in precipitation 2.6 JulAugust: 2.26 in precipitation 2.3 AugSeptember: 1.28 in precipitation 1.3 SepOctober: 1.07 in precipitation 1.1 OctNovember: 0.48 in precipitation 0.5 NovDecember: 0.39 in precipitation 0.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Woodrow 6nne, CO (8 mi away); precipitation: Brush 7.3 Sse, CO (4 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.

807335b
Hillrose, CO · 12 mi
807015b
Fort Morgan, CO · 15 mi
807505b
Snyder, CO · 16 mi
807205b
Akron, CO · 21 mi
807415b
Merino, CO · 26 mi
807225b
Atwood, CO · 27 mi
807575b
Woodrow, CO · 28 mi
806545a
Wiggins, CO · 29 mi

Colorado planting zones →

Questions about 80723

What planting zone is ZIP code 80723?

ZIP code 80723 (Brush, 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 Brush, CO?

The median last spring frost (32 °F) near 80723 is May 15; after May 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Woodrow 6nne station.

When is the first frost in Brush, CO?

The median first fall frost near 80723 is October 1, giving a median frost-free growing season of 140 days.

When should I plant tomatoes in 80723?

Start tomato seeds indoors around Mar 20 – Apr 3 and set transplants outside around May 22 – Jun 5, one to three weeks after the median last frost.

How much rain and snow does 80723 get?

About 16.3 inches of precipitation a year (NOAA 1991–2020 normals, Brush 7.3 Sse station).

How hot do summers get in Brush, CO?

The average high peaks at 91 °F in July, with about 65 days a year at 90 °F or more.

What kind of soil does 80723 have?

The USDA soil survey maps Valent at the center of ZIP 80723: sand, excessively drained, pH about 6.6 (neutral).

Did spring come early in Brush, CO in 2026?

Spring leaf-out near 80723 came on Mar 1 in 2026, 26 days earlier than the 1991–2020 average (Mar 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Brush, CO?

Long-day onions: the longest day near 80723 is 15 h 02 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 80723 change?

Yes. The 2012 USDA map put 80723 in zone 5a; the 2023 map puts it in zone 5b. The newer map uses 1991–2020 data and more weather stations.