Mathematics opportunities for advanced high school students

Here is a partial list of mathematics opportunities for advanced high school (or middle school) students. These are primarily focused in Colorado.

• The "Prove it!" math academy.
• The CU Boulder math circle.
• The CSU math circle.
• The UNC math circle.
• Though it is in California (not Colorado), I highly recommend the Euler Circle by my friend Simon Rubinstein-Salzedo.
• Famous national math camps include PROMYS, the Canada/USA math camp, and SUMaC (where I went); this list is certainly not complete.