One of the most rapidly growing innovations in education in the United States is the adoption of year-round calendars. The largest year-round operation during the 1970's and a model for many districts was run by the Jefferson County, Colorado, School District. After 14 years of year-round schooling, the district returned to a modified 9-month calendar in 1988. This document discusses the reasons for the calendar change. Factors in the decision include the following: increased demand for schools in new neighborhoods; the Board of Education view of year-round education as a temporary housing measure; administrative factors (year-round schools create more work for administrators at the building level and at the central office, the majority of the 112 schools in this district were on a 9-month schedule, etc.); the appeal of new school construction with technological advances; changing educational priorities of the county school board; failure to perceive the cost savings of year-round education; and stipulation by the board that all schools within an attendance area have the same calendar. Recommendations are made that address each of these barriers. Five tables are included. (LMI)