Where you at? If still at the campsite, wait 3 days, talk to Scar then go explore and find new areas. If after the mine then you need to drink the potion, put on the cold weather clothes and then cross.
4 days ago(+1)
Ok I'm dumb. Turns out I do have the recipie for warmth potion. Thank you anyways. Didn't know you also need a potion for this. :)