- Radio transmissions at the university date to 1912, when a professor named F.W. Springer began experimenting with broadcasts, though he probably just used a spark gap transmitter. Activities were suspended by World War I, but electrical engineering professor C.M. Jansky, Jr. was doing broadcasting again by 1920
- The first U of M football games are broadcasted in Morse code
- The University of Minnesota receives license for experimental radio station 9XI. Radiotelephone broadcasts began that fall with agricultural market reports, weather forecasts and concerts among the regularly scheduled programs. Initial broadcasts originated in the electrical engineering building on the Minneapolis campus, where a transmitter was mounted on the roof.
- The University received the first radio broadcasting license in the state of Minnesota on January 13, 1922 for the call sign WLB. The station is the 10th oldest station still on the air, beating out WHA at the University of Wisconsin Madison by a few hours. That also makes Radio K the oldest licensed non-commercial broadcast station in the country.
- In the 1930s and 1940s, the station broadcast a considerable amount of educational material and was used for distance learning — a practice that continued into the 1990s.
- Studios and facilities were moved from the electrical engineering building to Eddy Hall.
- The station call letters are changed from WLB to KUOM.
- A polio epidemic in 1946 that resulted in temporary school closings and the cancellation of the Minnesota State Fair led the station to create programming for children who were homebound. Minnesota School of the Air, as it was called, designed with the aid of teachers, substituted for the closed schools. Minnesota School of the Air continued into the 1980s, offering supplementary programming for in-school listening by elementary students. Those programs, along with others broadcast in the 1940s, were recognized for their importance and led to several awards being given to the station.
- Another station, WMMR (which would later merge with KUOM to form Radio K), was created on campus in 1948, with studios in Coffman Memorial Union. Focused on providing a service for the student body, it originally broadcast via carrier current on campus, using the frequency 730 AM (hence the oft-used tag-line "Radio 73") This was an entirely student-run operation, relying on volunteers. The station reaches five dormitories on the U campus.
- WMMR begins to sell commercial air time. The going rate: $4.50 a minute.
- WMMR’s dormitory listenership reaches 48%
- By the mid-60's through the end of its life, WMMR tried to emulate the management structure of a typical AM rocker of the day, with an appointed General Manager, Program Director, Music Director, and other management positions. From time to time, somebody actually sold an advertising slot, but the station more or less maintained itself using a small stipend from the Speech Communications department. Even then, the volunteers managed to put out programming for nearly 18 hours a day most days of the school year, and taught many a student the ins and outs of how to operate a studio. A news and sports operation broadcast daily reports, and the basketball, football and hockey programs were usually broadcast with live play-by-play. A number of live broadcasts from the Whole Music Club and the Great Hall at the union also took place, and the station served to promote other campus events such as the "Campus Carny" held annually in the old field house. Garrison Keillor, the well-known host of Minnesota Public Radio's A Prairie Home Companion, began his radio career broadcasting classical music on WMMR as a student in the early 1960s. He then worked at KUOM from 1963 to 1968.
- WMMR adopts format of half classical music and half rock music
- KUOM Program Guide from 1962
- In January 1968, WMMR is ordered shut down by the University’s Board of Governors due to financial reasons. However late that summer, with the help of University President Malcolm Moos, the station returns to the air. Rock music dominates the format. Soon after returning to the air, WMMR also covers that year’s presidential elections as part of an eight-station organization, which included live coverage of the Democratic National Convention in Chicago.
- KUOM introduces a whole series of programs by, for and about disadvantaged groups including On the Black Side, Echoes en Español, Indian News and Equal Voice: A Women’s Forum. These programs lasted until 1984.
- WMMR becomes an important national news source on campus strikes and protests during the Vietnam War.
- KUOM begins Scope, the first hour-long noncommercial news program on Twin Cities radio. Scope continues until 1985 when the format changes.
- Also in 1973, KUOM began broadcasts classes for credit in cooperation with the U of M’s Department of Independent Study. Early programs were simply lectures taped in the classroom. Later programs were specially produced for radio and, beginning in 1985, included a call-in component. The program lasted until 1991.
- The KUOM studios were moved again, this time to the 6th floor of the Rarig Center just across the Mississippi River on the West Bank.
- WMMR is programmed as a Top 40 station. Listenership is on the rise. The students in charge go on to run commercial Top 40 station WLOL.
- WMMR format is changed to College/Alternative.
- KUOM adopts call-in format to make use of the expertise of University faculty. Each program has a subject matter expert or two, usually at least one a University professor. Topics areas included current events, political and social issues, the arts, and practical topics such as gardening, home maintenance, etc. The format change was made at the direction of the University administration, which ordered KUOM to "stop duplicating" programming heard on other Twin Cities' noncommercial stations, notably Minnesota Public Radio. This style of program continues until 1993.
- 1987 KARE-TV Report on KUOM-AM
- 1987 KARE-TV Report on WMMR-AM
- Technical problems, including the main audio board catching fire, knock WMMR off the air. All problems are eventually fixed, but listenership drops to single digits.
- For nearly 70 years, WLB and later KUOM time-shared the already daytime-restricted 770 kHz frequency with WCAL of St. Olaf College in Northfield, Minnesota, so each station averaged just about six hours of programming each day. The University of Minnesota eventually made an agreement with St. Olaf where WCAL would get land for a powerful FM transmitter on U of M land near Rosemount, Minnesota in exchange for the shutdown of WCAL's AM transmitter so that KUOM could transmit exclusively on the frequency during the day. The agreement came to fruition in 1991.
- Radio K is born. In the early 1990s, after a great deal of lobbying by WMMR General Manager Jim Musil — who also designed the purple Radio K logo of the time— the university began to examine the idea of merging WMMR and KUOM. The university explained the transition to a music format by saying that most of the educational value of KUOM had been superseded by other media outlets by this time.
- The transition finally took place in 1993, and the station started broadcasting as "Radio K" on October 1 that year. The first song ever played on Radio K was “Do You Remember Rock n Roll Radio?” by The Ramones. To avoid the lack of direction found at some college music stations, the new "Radio K" had a small full-time staff to oversee operations and provide a certain level of continuity, while students would provide much of the on-air talent while going through their radio studies. It is a training ground for students, programming alternative rock and other materials of interest to a student age audience. The station is given a three-year trial period to prove itself.
- Radio K’s website, RadioK.org, launches
- A Review Committee established by the Dean of Continuing Education and Extension recommends Radio K be continued indefinitely and the University continue to provide financial support for the station.
- Twin Cities Reader article about Radio K
- K launches its innovative BuyaWatt program to generate listener financial support. The station also begins streaming its programming on the Internet using RealAudio technology.
- In April, Radio K conducts its first PowerSurge on-air listener fundraiser.
- Radio K Commercial (2000)
- Radio K Online Tour
- In the summer, translator station W264BR begins re-broadcasting KUOM-FM and KDXL-FM from the KUOM-AM tower in Falcon Heights.
- The August 2005 Rolling Stone issue features an article on "Schools that Rock" naming Radio K the reason that the University of Minnesota rocks. (Click here to view the gallery)
- Radio K changes its trademark purple logo to a new, modern blue design and also changes its slogan from “Real College Radio” to the new “Where Music Matters Most”
- A 99-watt translator located at 104.5 FM goes live. It is located near Radio-K's studios in the Rarig Center on the West Bank Minneapolis campus of the University of Minnesota.
- October 3, 2009 - Radio K goes on the FM 24 hours per day at 104.5 FM and 100.7 FM
Hear the FM 24/7 announcement:
- Radio K FM 24/7 Kare 11 News Report
- Radio K Studio Tour 2010
- Station tour proves radio is not dead - MN Daily - 9/27/2010
- Radio K now regularly receives accolades from local newspapers and magazines, especially the weekly City Pages which has consistently ranked the station among the best for music in the region. Pitchfork Media founder Ryan Schreiber also commonly cites the station's influence as having been an integral factor in his decision to start an online publication dedicated to the coverage of independent music. The station receives about 120 new recordings each month which are filtered through a large group of reviewers and disc jockeys. Recordings that pass muster are added to a large playlist that is constantly updated, and on-air DJs use the list for about 60% of the music played while choosing the rest on their own.
- President Kaler was on Radio K's Rock 'n Roll Over to celebrate back to school and his inauguration week! He had never been to the the "penthouse" level of Rarig, (i.e the 6th floor), and Todd played his favorite song of all time, "Luckenbach, Texas" by Waylon Jennings.
- Mayor R.T. Rybak declares September 21st to be Radio K Day in Minneapolis
- Radio K Celebrates 100 Years of Putting R-A-D in Radio
- Radio K is featured in Billboard Magazine: Learned It on the Radio
- Radio K is featured in Minnesota Magazine: 100 Years of Campus Radio
- The Minneapolis Star Tribune runs the piece Radio K: 100 years young to commemorate 100 years of radio at the University of Minnesota.
- Radio K alum Andrew LaValle assembled Radio K history storyboards featuring cool and interesting items of significance from our past in celebration of our 100 year anniversary. Enjoy and long live the K!
- Radio K Studio tour 2012
- City Pages declares Radio K "Best Radio Station"
- Radio K wins three awards at the College Music Journal convention
- Best Community Resource
- Biggest Champion of the Local Scene
- Most Creative Programming
- These achievements are mentioned in national news outlets