I am going to put cedar tongue and groove on my soffit, I was wondering if I can just use a 1x6 as the fascia. Thanks in advance. My concern is that it will not last.
Absolutely. My 26 year old Minnesota home has full cedar treatment and looks great today.
That's not to say that you can simply leave it raw, or seal it once and forget it. Sun and rain constantly work at it, so plan on applying a high-quality penetrating oil product initially and every 3-5 years thereafter.