Nascar betting sites start to put out NASCAR race odds even before the teams conduct their first training and test runs. The important thing is that if the bookmaker puts out the odds long before the start - the margin would be high, but at the same time, there is a high possibility that some valuable markets can be found in the line. Bookmakers give the most optimal quotes around 2-3 days before the start of the race - and the most active fans of races influence the level of the odds.