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When to plant crocuses in Olsztyn: 17 October – 16 December

In Olsztyn, crocus: plant from 17 October to about 16 December. For planting stock, the places nearby include Olkwiat (garden centre, 1 km) and Sklep Ogrodniczy (garden centre, 1 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 Olsztyn: soil, season and weather

Nights then average below 0 °C in December–March; the coldest, January, averages -3.5 °C.

Planting17 October – 16 December
First autumn frost16 November
Coldest nightsJanuary, -3.5 °C
Soil back at 1 °C in spring29 January
Daylight10:30 on 17 October
Daylight at the winter solstice7:25

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

Crocus in Olsztyn: 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 Olsztyn the average daily temperature stays at 10 °C or lower for about 29 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

Around Olsztyn, Białystok is 15 days earlier and Gdańsk 3 days later.

CityDistanceDateDifference
Kaliningrad103 km15 October – 30 December2 days earlier
Gdańsk135 km20 October – end of December3 days later
Warsaw176 km18 October – 27 December1 day later
Bydgoszcz179 km13 October – end of December4 days earlier
Białystok192 km2 October – 6 December15 days earlier
Grodno221 km9 October – 3 December8 days earlier

Where to buy crocus for planting in Olsztyn

Planting stock goes into the ground from 17 October to about 16 December; buy it before that. Within 15 km of Olsztyn OpenStreetMap lists 2 garden centres, 1 plant nursery, 5 markets and 2 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Olsztyn?

In Olsztyn, crocus: plant from 17 October to about 16 December. 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 Olsztyn?

Last spring frost around 28 April, first autumn frost around 16 November.

Other crops in Olsztyn, with their dates