The best replacement for boulder is denver.

The best alternatives to boulder are rated as following:
★★★★★  denver
★★★  fort collins
★★  colorado springs
★★  portland
★  eugene
★  longmont
★  boulder
  csu
  ravine
  aspen
  fort collins colorado
  bolder
  austin
  golden
  golden in denver
  asheville
  ayre
  hoover
  evergreen
  simaudio
  colorado state
  trek 820
  casio rock
  boulder se
  motorola barrage
  fairview

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Google Trends

Scale is based on the average worldwide traffic of boulder in all years. Click on graph for more.
boulder
denver
fort collins