Greenly Garden
Get the app
EN

When to plant crocuses in Sioux Falls: 21 September – 16 November

In Sioux Falls, crocus: plant from 21 September to about 16 November. For planting stock, the places nearby include Prairie Greens Produce (farm shop, 14 km); addresses and opening hours are below.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Crocus in Sioux Falls: soil, season and weather

Nights then average below 0 °C in November–March; the coldest, January, averages -11 °C.

Planting21 September – 16 November
First autumn frost21 October
Coldest nightsJanuary, -11 °C
Soil back at 1 °C in spring5 March
Daylight12:16 on 21 September
Daylight at the winter solstice8:56

The same dates in Sioux Falls hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Sioux Falls: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Sioux Falls the average daily temperature stays at 10 °C or lower for about 26 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

All the nearest cities on our list plant crocus later than Sioux Falls; the closest date is in Pierre, 3 days later.

CityDistanceDateDifference
Omaha262 km26 September – 30 November5 days later
Pierre302 km24 September – 19 November3 days later
Lincoln304 km28 September – 7 December7 days later
Minneapolis319 km24 September – 10 November3 days later
Grand Island321 km27 September – 1 December6 days later
Des Moines334 km27 September – 29 November6 days later

Where to buy crocus for planting in Sioux Falls

Planting stock goes into the ground from 21 September to about 16 November; buy it before that. Within 15 km of Sioux Falls OpenStreetMap lists 1 garden centre, 5 farm-supply shops, 2 markets and 1 farm shop (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Sioux Falls?

In Sioux Falls, crocus: plant from 21 September to about 16 November. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Sioux Falls?

Last spring frost around 24 April, first autumn frost around 21 October.

Other crops in Sioux Falls, with their dates