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|Venue||Hyatt Regency Tech Center-Denver|
|Organized by||MileHiCon, Inc.|
MileHiCon is an annual science fiction/fantasy convention held in Denver, Colorado in October. It is primarily literary, although it also has an art show, dealers' room, the Critter Crunch (similar to Robot Wars), the Critter Float-illa (robotic competition in the hotel pool), a video room, anime room, masquerade, gaming, bat'leth tournament, and programming on science, writing, literary, media and fannish topics. It runs its own track of kid-friendly, interactive programming and also hosts the Avistrum Academy of Sorcery. It is run by MileHiCon, Inc., a Colorado not-for-profit corporation, and donates money each year to local literacy programs.
MileHiCon was started by the Denver Area Science Fiction Association (DASFA). Following the monthly meeting in September 1969, several DASFAns discussed their recent experiences at the St. Louis WorldCon and it was decided to hold an SF (science fiction) Mini-Convention for the next meeting. However, due to some planning hitches and the inability of some key people to attend, it was postponed until November.
The name of the evening-long event was shortened to Minicon. It was held in the basement meeting room of the Columbia Savings Bank, where DASFA met at that time. DASFA soon discovered that another convention called Minicon had been started the previous year in Minneapolis. Since that name was taken, DASFA decided to rename it Octocon, since (after the first one) it was held in October. After a couple of years holding Octocon, they discovered there was a convention in Ireland called Octocon. DASFA then renamed the convention again. Two final proposals for the title were:
- "MileHiCon," which plays off Denver being "the Mile-High City," and would be unlikely to be duplicated;
- "LungfishGranolaCon," which refers to an ancient DASFA tradition of lungfish jokes, a type of word game.
"MileHiCon" was chosen, after a close vote.
Around 1980, MileHiCon was incorporated as an entity separate from DASFA (which still meets, but is not incorporated). For the last several years, attendance has generally hovered around a thousand.
MileHiCon 43 was held 21–23 October 2011. Guests included authors Vernor Vinge and Glen Cook, and editor Gardner Dozois with artist guest Theresa Mather. Denver author Mario Acevedo was the toastmaster.
MileHiCon 46 was held 24–26 October 2014. Guests included authors Daniel Abraham (author) and Ty Franck (who also write together as James S.A. Corey) and Michael Swanwick. Artist guests were Phil Foglio and Kaja Foglio. Denver author Jeanne C. Stein was the toastmaster. 
MileHiCon 47 was held 23–25 October 2015. Guests included authors Kevin Hearne and Kristine Kathryn Rusch. Artist guest was Ursula Vernon. James Van Pelt was the toastmaster. 
MileHiCon 48 is scheduled for 28–30 October 2016. Guests will include authors John Varley and Kelley Armstrong. Artist guest will be Julie Dillon. Chaz Kemp will be the toastmaster.