First and Last Frost Dates in Finland

This first color coded map is what is used most commonly in Finland to determine where in the country plants will perform best. The map below uses a different numbering system than what you’d see used in the USA, for example. PlantsMap is a wonderful resource – you can find your zone HERE

suomi-hardiness-zone-map

First frost refers to the time in autumn when winter conditions are beginning, and it’s important to protect tender plants outdoors.

Lohja is located in Zone 11 and can expect first frost in the autumn between Nov. 11 – Nov. 20.

Click HERE to activate an interactive map of first frost dates throughout Finland (Klikkaa TÄSTÄ aktivoidaksesi interaktiivisen kartan ensimmäisistä pakkaspäivistä koko Suomessa)

Last frost refers to the time in spring when winter conditions are over, and it’s safe to plant outdoors.

Click HERE to activate an interactive map of last frost dates throughout Finland (Klikkaa TÄSTÄ aktivoidaksesi interaktiivisen kartan viimeisten pakkasten päivämääristä koko Suomessa)

The PlantsMap Hardiness Zones of Finland in CELSIUS

Lohja is considered to be 6a -23.3C to -20.5C click HERE to activate an interactive map of Finnish hardiness zones – it looks like the following picture