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
Knowing when the last frost date occurs is highly important for anyone farming, gardening and planting in the soil. Lohja is located in Zone 13 – which corresponds to a May 11 – May 20 last frost date, according to PlantsMap Data
Click HERE to activate an interactive map of last frost dates throughout Finland


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

