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våran/vårat are slang and colloquial language. it's one of those things my swedish teacher always complained about when she read my texts, I always wrote vårat/våran instead or vår/vårt. you usually say våran/vårat when you speak, to say vår/vårt is kind of formal :) hope this made things a bit clearer!

Våran and vårat are colloquial forms. Using them in writing may by some be seen as ignorant or childish. Vår and vårt are always correct, both in formal and informal texts.