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When to plant crocuses in Viana do Castelo: by 12 November

In Viana do Castelo, crocus: plant by 12 November. The winter here is too mild for our late-planting rule, so we give no later limit.

Crocus in Viana do Castelo: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 4.3 °C.

Plantingby 12 November
First autumn frost12 December
Coldest nightsJanuary, 4.3 °C
Soil back at 1 °C in springalready in the first week of January
Daylight9:58 on 12 November
Daylight at the winter solstice9:09

The same dates in Viana do Castelo hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Viana do Castelo: 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 Viana do Castelo the average daily temperature stays at 10 °C or lower for about 15 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 Viana do Castelo, Ourense is 9 days earlier and Braga 11 days later.

CityDistanceDateDifference
Braga37 kmby 23 November11 days later
Porto63 kmby 19 November7 days later
Vila Real101 kmby 22 November10 days later
Ourense108 kmby 3 November9 days earlier
Santiago de Compostela135 kmby 17 November5 days later
Viseu138 kmby 10 November2 days earlier

Where to buy crocus for planting in Viana do Castelo

Planting stock goes into the ground by 12 November; buy it before that. Within 15 km of Viana do Castelo OpenStreetMap lists 1 farm-supply shop, 1 plant nursery and 3 markets (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Viana do Castelo?

In Viana do Castelo, crocus: plant by 12 November. The winter here is too mild for our late-planting rule, so we give no later limit.

When is the last spring frost in Viana do Castelo?

Last spring frost around 3 February, first autumn frost around 12 December.

Other crops in Viana do Castelo, with their dates