The Colorado Center Party has achieved qualified party status by having registered 1,000 members. Colorado now has nine qualified parties, the most of any state in the west and the most in its history. Small qualified parties in Colorado generally nominate by convention, not primary.
No other state in the west has ever had that many qualified parties. The definition of a qualified party in Colorado was eased in 1998. Before then, a qualified party was one that had polled 10% for Governor, but Colorado’s minor parties lobbied successfully for the easier definition.
Here is a link to the latest tally of registered voters in Colorado, showing the Colorado Center Party with 1,062 members.