Is DraftKings Sportsbook Legal In Colorado? Will the app work in CO? A Is DraftKings Sportsbook Legal In Colorado? Will the app work in CO? Yes, DraftKings Sportsbook is legal and the app will work within state lines. You can find the link RIGHT HERE. Related FAQs Is FOX Bet legal In Colorado? Will the app work in CO? Is William Hill legal In Colorado? Will the app work in CO?