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

Planting zone for 50023 — Ankeny, IA

ZIP code 50023 (Ankeny, Polk County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 23 and the first fall frost October 15.

Where ZIP 50023 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 frostApr 23
First frostOct 15
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 Ankeny, IA…

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 Ankeny, IA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 23median — 50% chance of a later frost
Safe for tender plantsMay 6only 10% chance of frost after
First fall frostOctober 15median — 10% chance by Sep 30
Growing season173 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around October 25.

From the NOAA station Ankeny, IA — within 1 mile, elevation 974 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 50023

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 12 – Mar 26
SpinachSow outdoors · Mar 12 – Apr 2
Broccoli, cabbageStart indoors · Feb 12 – Feb 26
Broccoli, cabbageTransplant · Apr 2 – Apr 16
Onion setsPlant outdoors · Mar 26 – Apr 9
PotatoesPlant outdoors · Apr 2 – Apr 16
LettuceSow outdoors · Mar 26 – Apr 9
Carrots, beetsSow outdoors · Apr 2 – Apr 16
TomatoesStart indoors · Feb 26 – Mar 12
TomatoesTransplant · Apr 30 – May 14
Peppers, eggplantStart indoors · Feb 12 – Feb 26
Peppers, eggplantTransplant · May 7 – May 21
BeansSow outdoors · Apr 30 – May 14
Sweet cornSow outdoors · Apr 30 – May 14
Cucumbers, squashSow outdoors · Apr 30 – May 14
Fall lettuce, spinachSow outdoors · Aug 20 – Sep 3
GarlicPlant cloves · Oct 1 – Nov 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 15) 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 50023 came on Mar 23 — 12 days earlier than the 1991–2020 average (Apr 4).

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 Iowa

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

Trees 49

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °Fbalsam fir60 ft · blooms mid summer · low shade tolerance · to −43 °F

Shrubs 77

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 191

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 136

arctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fblue grama1 ft · blooms early summer · high shade tolerance · to −43 °F

Vines 7

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °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 Ankeny, IA.

Soil in Ankeny, IA

The center of ZIP 50023 is mapped as Urban land: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 50023; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ankeny, IA

Summer high86 °Faverage high, July
Winter low12 °Faverage low, January
Hot days23days a year at 90 °F or more
Freezing nights150nights a year at 32 °F or less
Growing degree days3,262base 50 °F — the season’s usable heat
Longest day15 h 13 mindaylight on June 21
Shortest day9 h 09 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation37 inper year, rain and melted snow
Snowfall25 inper year; 52 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 30 °F, low 12 °F 30°12° JanFebruary: average high 34 °F, low 16 °F 34°16° FebMarch: average high 47 °F, low 27 °F 47°27° MarApril: average high 61 °F, low 38 °F 61°38° AprMay: average high 72 °F, low 50 °F 72°50° MayJune: average high 82 °F, low 61 °F 82°61° JunJuly: average high 86 °F, low 65 °F 86°65° JulAugust: average high 84 °F, low 62 °F 84°62° AugSeptember: average high 77 °F, low 53 °F 77°53° SepOctober: average high 64 °F, low 41 °F 64°41° OctNovember: average high 48 °F, low 29 °F 48°29° NovDecember: average high 35 °F, low 18 °F 35°18° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 0.97 in precipitation, 6.2 in snowfall 1.0❄6 JanFebruary: 0.99 in precipitation, 8 in snowfall 1.0❄8 FebMarch: 2.01 in precipitation, 3.7 in snowfall 2.0❄4 MarApril: 4.00 in precipitation, 0.7 in snowfall 4.0❄1 AprMay: 5.26 in precipitation 5.3 MayJune: 5.37 in precipitation 5.4 JunJuly: 4.19 in precipitation 4.2 JulAugust: 4.72 in precipitation 4.7 AugSeptember: 3.62 in precipitation 3.6 SepOctober: 2.67 in precipitation, 0.6 in snowfall 2.7❄1 OctNovember: 1.86 in precipitation, 1 in snowfall 1.9❄1 NovDecember: 1.39 in precipitation, 4.5 in snowfall 1.4❄5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ankeny, IA (within 1 mile); precipitation: Ankeny, IA (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

500215b
Ankeny, IA · 3 mi
503015b
Des Moines, IA · 5 mi
503025b
Des Moines, IA · 5 mi
503035b
Des Moines, IA · 5 mi
503045b
Des Moines, IA · 5 mi
503055b
Des Moines, IA · 5 mi
503065b
Des Moines, IA · 5 mi
503085b
Des Moines, IA · 5 mi

All 2 ZIP codes in Ankeny → · Iowa planting zones →

Questions about 50023

What planting zone is ZIP code 50023?

ZIP code 50023 (Ankeny, IA) 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 Ankeny, IA?

The median last spring frost (32 °F) near 50023 is April 23; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ankeny station.

When is the first frost in Ankeny, IA?

The median first fall frost near 50023 is October 15, giving a median frost-free growing season of 173 days.

When should I plant tomatoes in 50023?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 50023 get?

About 37 inches of precipitation a year and 25 inches of snowfall (NOAA 1991–2020 normals, Ankeny station).

How hot do summers get in Ankeny, IA?

The average high peaks at 86 °F in July, with about 23 days a year at 90 °F or more.

Did spring come early in Ankeny, IA in 2026?

Spring leaf-out near 50023 came on Mar 23 in 2026, 12 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ankeny, IA?

Long-day onions: the longest day near 50023 is 15 h 13 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 50023 change?

Yes. The 2012 USDA map put 50023 in zone 5a; the 2023 map puts it in zone 5b. The newer map uses 1991–2020 data and more weather stations.