I live in the area too!

Free gifted school (Denver Public Schools): Polaris at Ebert. Both my niece & nephew went there and LOVED it.

Some gifted programming in Denver at each school

Logan school and Ricks Center are private school options. We have toured Ricks... seems great for younger years.

Gifted kids can occasionally "grow out" of Montessori but, that said, my DD3 is in one and loves it (3-6 class)