Are there any really spectacular places to have a wedding in Boulder?

The Boulderado Hotel on 13th is a very good option for cooler weather weddings. They have a grand staircase in the original section of the hotel with a large landing that is a great place for wedding ceremonies and photos. They have good food and beverage service as well as plenty of very nice hotel rooms for the entire wedding party as well as out of town guests. There are also several chuches of different denominations within walking distance of the hotel. It's well worth checking into.

I went to a wedding at the Flagstaff Amphitheatre this summer, I guess there is nearly one a week when the weather is fine...it is a classic spot. Drive up Flagstaff Road (where Baseline deadends to the west) and check out the spot, there is a sign---keep climbing till you see the turnoff to the right

Chautauqua National Historic Monument offers a few on site venues that will provide the guests with the up close view of the Flatirons everyone loves. The Hotel Boulderado is also an incredible venue (I've attended two weddings there).