School Year Dates

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Jefferson County School District No. R-1 school calendar 2026-27

First day, last day, breaks, holidays and teacher workdays, read from the district's own calendar.

Open the district's calendar (resources.finalsite.net)Add to your calendar (.ics)

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 Jefferson County School District No. R-1 or any other school district. Official calendar: resources.finalsite.net.

First day
Fall Break
to
Thanksgiving Break
to
Winter Break
to
Spring Break
to
Last day

Kindergarten, pre-K, individual grades and particular schools may have different start dates or schedules. Check the district calendar for your child's grade and school.

Unmarked weekdays and computed counts use only the breaks, holidays and teacher workdays listed here. Other closures may be missing, so these are potential weekdays, not verified days of attendance.

Month by month

  • Weekday in term
  • Break
  • Holiday
  • No students (teacher workday)
  • Early release
  • First day
  • Last day
August 2026
SMTWTFS
1
2345678
91011 Teacher Staff Development121314 Teacher Staff Development15
16171819 First day of school20 Weekday in term21 Weekday in term22
2324 Weekday in term25 Weekday in term26 Weekday in term27 Weekday in term28 Weekday in term29
3031 Weekday in term
September 2026
SMTWTFS
1 Weekday in term2 Weekday in term3 Weekday in term4 Weekday in term5
67 Labor Day8 Weekday in term9 Weekday in term10 Weekday in term11 Weekday in term12
1314 Weekday in term15 Weekday in term16 Weekday in term17 Weekday in term18 Teacher Staff Development19
2021 Weekday in term22 Weekday in term23 Weekday in term24 Weekday in term25 Weekday in term26
2728 Weekday in term29 Weekday in term30 Weekday in term
October 2026
SMTWTFS
1 Weekday in term2 Weekday in term3
45 Weekday in term6 Weekday in term7 Weekday in term8 Weekday in term9 Weekday in term10
1112 Fall Break13 Fall Break14 Weekday in term15 Weekday in term16 Weekday in term17
1819 Weekday in term20 Weekday in term21 Weekday in term22 Weekday in term23 Weekday in term24
2526 Weekday in term27 Weekday in term28 Weekday in term29 Weekday in term30 Weekday in term31
November 2026
SMTWTFS
12 Weekday in term3 Weekday in term4 Weekday in term5 Weekday in term6 Weekday in term7
89 Weekday in term10 Weekday in term11 Weekday in term12 Weekday in term13 Weekday in term14
1516 Weekday in term17 Weekday in term18 Weekday in term19 Weekday in term20 Weekday in term21
2223 Thanksgiving Break24 Thanksgiving Break25 Thanksgiving Break26 Thanksgiving Break; Thanksgiving Day27 Thanksgiving Break28
2930 Weekday in term
December 2026
SMTWTFS
1 Weekday in term2 Weekday in term3 Weekday in term4 Weekday in term5
67 Weekday in term8 Weekday in term9 Weekday in term10 Weekday in term11 Weekday in term12
1314 Weekday in term15 Weekday in term16 Weekday in term17 Weekday in term18 Weekday in term19
2021 Winter Break22 Winter Break23 Winter Break24 Winter Break25 Winter Break; Christmas Day26 Winter Break
27 Winter Break28 Winter Break29 Winter Break30 Winter Break31 Winter Break
January 2027
SMTWTFS
1 Winter Break; New Year's Day2 Winter Break
3 Winter Break4 Winter Break; Teacher Staff Development5 Winter Break; Teacher Staff Development6 Weekday in term7 Weekday in term8 Weekday in term9
1011 Weekday in term12 Weekday in term13 Weekday in term14 Weekday in term15 Weekday in term16
1718 Martin Luther King19 Weekday in term20 Weekday in term21 Weekday in term22 Weekday in term23
2425 Weekday in term26 Weekday in term27 Weekday in term28 Weekday in term29 Weekday in term30
31
February 2027
SMTWTFS
1 Weekday in term2 Weekday in term3 Weekday in term4 Weekday in term5 Weekday in term6
78 Weekday in term9 Weekday in term10 Weekday in term11 Weekday in term12 Teacher Staff Development13
1415 Presidents’ Day16 Weekday in term17 Weekday in term18 Weekday in term19 Weekday in term20
2122 Weekday in term23 Weekday in term24 Weekday in term25 Weekday in term26 Weekday in term27
28
March 2027
SMTWTFS
1 Weekday in term2 Weekday in term3 Weekday in term4 Weekday in term5 Weekday in term6
78 Weekday in term9 Weekday in term10 Weekday in term11 Weekday in term12 Weekday in term13
1415 Weekday in term16 Weekday in term17 Weekday in term18 Weekday in term19 Weekday in term20
2122 Spring Break23 Spring Break24 Spring Break25 Spring Break26 Spring Break27
2829 Teacher Staff Development30 Weekday in term31 Weekday in term
April 2027
SMTWTFS
1 Weekday in term2 Weekday in term3
45 Weekday in term6 Weekday in term7 Weekday in term8 Weekday in term9 Weekday in term10
1112 Weekday in term13 Weekday in term14 Weekday in term15 Weekday in term16 Weekday in term17
1819 Weekday in term20 Weekday in term21 Weekday in term22 Weekday in term23 Weekday in term24
2526 Weekday in term27 Weekday in term28 Weekday in term29 Weekday in term30 April 30
May 2027
SMTWTFS
1
23 Weekday in term4 Weekday in term5 Weekday in term6 Weekday in term7 Weekday in term8
910 Weekday in term11 Weekday in term12 Weekday in term13 Weekday in term14 Weekday in term15
1617 Weekday in term18 Weekday in term19 Weekday in term20 Weekday in term21 Weekday in term22
2324 Weekday in term25 Weekday in term26 Weekday in term27 Last Day of School Dismissal Notice; Last day of school28 Teacher Staff Development29
3031 Memorial Day

The 2026-27 year in words

Students in Jefferson County School District No. R-1 go back on . The year ends on , roughly 40 weeks later, with 171 potential weekdays in between after only the days off listed here are counted out. After listed exceptions, the first week has three potential weekdays and the last week has four.

4 breaks are marked on the calendar. Fall Break runs through : 2 days off the calendar, 2 of them weekdays. Thanksgiving Break runs through : 5 days off the calendar, 5 of them weekdays. Students are off for Winter Break from to , 16 days counting weekends and 12 weekdays counting Monday through Friday. Spring Break starts and ends , a total of 5 days with 5 weekdays off. The longest is Winter Break at 16 days.

Between and there are 28 potential weekdays with no listed closure, the longest such run in this summary. After subtracting listed closures, winter break divides the remaining potential weekdays into 79 before it and 92 after it.

6 other days off are marked as holidays: Labor Day (), Martin Luther King (), Presidents’ Day (), April 30 (), Memorial Day () and Juneteenth (observed) (). For a three-day weekend, look at Labor Day, Martin Luther King, Presidents’ Day, April 30, Memorial Day and Juneteenth (observed), which sit next to a weekend.

8 teacher workdays without students are listed, the first on and the last on . Students leave early on .

Of the 5 Colorado districts listed here, 1 start after Jefferson County School District No. R-1, 3 start before it. The group's median first day is . The earliest first day on the site in Colorado is (Aurora Joint District No. 28 of the counties of Adams and A) and the latest is (School District 27J).

The source does not say whether the board has approved this calendar, so treat the dates as the district's current published plan and check before you commit to travel.

We read these dates from a PDF calendar on resources.finalsite.net on . We summarize dates only; the district's own calendar is the version that counts.

Dates in detail

Breaks
BreakStartsEndsDaysWeekdays
Fall Break22
Thanksgiving Break55
Winter Break1612
Spring Break55
Holidays
DayDate
Labor Day
Thanksgiving Day
Christmas Day
New Year's Day
Martin Luther King
Presidents’ Day
April 30
Memorial Day
Juneteenth (observed)
Teacher workdays (no students)
DayDate
Teacher Staff Development
Teacher Staff Development
Teacher Staff Development
Teacher Staff Development
Teacher Staff Development
Teacher Staff Development
Teacher Staff Development
Teacher Staff Development
Early release
DayDate
Last Day of School Dismissal Notice
Potential weekdays by month, after listed exceptions
MonthPotential weekdays
August 20269
September 202620
October 202620
November 202616
December 202614
January 202717
February 202718
March 202717
April 202721
May 202719

Where these dates come from

Source: resources.finalsite.net (a PDF calendar), read on . Districts revise calendars after severe weather, board votes and contract settlements, so the district's own page is the version that counts. If a date here looks wrong, tell us and we will re-check the source. How we check.

Other Colorado districts

Districts in Colorado close in size to Jefferson County School District No. R-1, with their own calendars on this site:

All Colorado districts