School Year Dates

When does school start in Colorado? 2026-27 first days

School start dates for 5 Colorado districts, each from the district's own calendar.

Independent site, not affiliated with any school district. School Year Dates is an independent publisher. We are not affiliated with, endorsed by or operated by any school district listed here or any other school district.

Among the 5 districts on this site, the earliest start is (Aurora Joint District No. 28 of the counties of Adams and A) and the latest is (School District 27J), a gap of 14 days. The median first day is .

For Jefferson County School District No. R-1, the student year runs from through . Of its 4 listed breaks, Winter Break lasts longest: 16 days, beginning and ending . Counting weekdays between those endpoints and removing the listed breaks, holidays and teacher workdays leaves 171 potential weekdays. The first week contains 3 potential weekdays and the final week contains 4. These counts use only the exceptions listed here; missing closures can reduce them. They are not verified attendance totals.

The dates for Aurora Joint District No. 28 of the counties of Adams and A begin with and end with . Winter Vacation is its longest listed break, covering 12 days between and . There are 6 breaks in this calendar. Counting weekdays between those endpoints and removing the listed breaks, holidays and teacher workdays leaves 175 potential weekdays. The first week contains 2 potential weekdays and the final week contains 5. These counts use only the exceptions listed here; missing closures can reduce them. They are not verified attendance totals.

The dates for St. Vrain Valley School District No. Re1J begin with and end with . Winter Break is its longest listed break, covering 12 days between and . There are 3 breaks in this calendar. Counting weekdays between those endpoints and removing the listed breaks, holidays and teacher workdays leaves 176 potential weekdays. The first week contains 4 potential weekdays and the final week contains 4. These counts use only the exceptions listed here; missing closures can reduce them. They are not verified attendance totals.

Boulder Valley School District No. Re2 opens on and finishes on . Its calendar lists 3 breaks; the longest is Spring break - no school, from to , lasting 5 calendar days. Counting weekdays between those endpoints and removing the listed breaks, holidays and teacher workdays leaves 182 potential weekdays. The first week contains 3 potential weekdays and the final week contains 4. These counts use only the exceptions listed here; missing closures can reduce them. They are not verified attendance totals.

School District 27J opens on and finishes on . Its calendar lists 3 breaks; the longest is Winter Break, from to , lasting 12 calendar days. Counting weekdays between those endpoints and removing the listed breaks, holidays and teacher workdays leaves 185 potential weekdays. The first week contains 2 potential weekdays and the final week contains 4. These counts use only the exceptions listed here; missing closures can reduce them. They are not verified attendance totals.

First day of school by week

When does school end in Colorado?

Last days fall between (Boulder Valley School District No. Re2) and (School District 27J), with a median of .

Each district page has the month-by-month calendar, winter and spring break dates and the link to the district's own calendar. The Colorado hub lists every district with its first day, last day and breaks in one table. Districts revise calendars during the year, so confirm dates on the district's page before you plan around them.