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When to plant crocuses in Locarno: 23 August – 27 October

In Locarno, crocus: plant from 23 August to about 27 October. For planting stock, the places nearby include Schober Giardini (garden centre, 2 km) and Brico SA (garden centre, 3 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 Locarno: soil, season and weather

Nights then average below 0 °C in November–April; the coldest, January, averages -9.7 °C.

Planting23 August – 27 October
First autumn frost22 September
Coldest nightsJanuary, -9.7 °C
Soil back at 1 °C in spring22 April
Daylight13:48 on 23 August
Daylight at the winter solstice8:37

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

Crocus in Locarno: 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 Locarno the average daily temperature stays at 10 °C or lower for about 39 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 Locarno; the closest date is in Bellinzona, 54 days later.

CityDistanceDateDifference
Bellinzona17 km16 October – end of December54 days later
Lugano22 km5 November – end of December74 days later
Como46 km24 October – end of December62 days later
Novara81 km23 October – end of December61 days later
Milan85 km31 October – end of December69 days later
Bergamo85 km19 October – end of December57 days later

Where to buy crocus for planting in Locarno

Planting stock goes into the ground from 23 August to about 27 October; buy it before that. Within 15 km of Locarno OpenStreetMap lists 5 garden centres, 1 farm-supply shop and 4 farm shops (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Locarno?

In Locarno, crocus: plant from 23 August to about 27 October. 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 Locarno?

Last spring frost around 23 May, first autumn frost around 22 September.

Other crops in Locarno, with their dates