With the busy holiday season and all, how long should a letter from Colorado take to reach California?|156642

I_m writing a letter to someone in California and I want them to receive it by Christmas Eve. When should I mail it?

I would mail it soon, by Friday at the latest, as Christmas cards and packages are starting to go out in force slowing mail delivery down from the normal 3-5 days to 5-7 days.

a day or two at the most its not that far away and first class mail
is moving fast during the christmas season the packages are a bit slower but
not the first class stuff.