Boulder County Colorado Schools Calendar

Two public school districts serve nearly all of the roughly 45,000 students in Boulder County: Boulder Valley School District RE-2 and St. Vrain Valley Schools RE-1J. Boulder Valley covers Boulder, Louisville, Lafayette, Superior, Nederland, and the foothills, while St. Vrain Valley reaches Longmont, Lyons, Niwot, Erie, Firestone, and Frederick across the northern and eastern parts of the county. Each elected board sets its own calendar, so a family in Boulder and a family in Longmont can have different start dates, break weeks, and snow-day rules even though they share a county line.

School District Structure in Boulder County

Colorado has no countywide school systems, and Boulder County government has no authority over school calendars. The county seat is Boulder, but education is run by locally elected boards. Two districts serve the county:

• Boulder Valley School District RE-2: based in Boulder, it serves Boulder, Louisville, Lafayette, Superior, Gunbarrel, Eldorado Springs, and the mountain community of Nederland. Its schools range from urban Boulder campuses to small mountain schools.
• St. Vrain Valley Schools RE-1J: headquartered in Longmont, it serves Longmont, Lyons, Niwot, Mead, Firestone, Frederick, Dacono, and Erie. It is one of the fastest-growing districts in the state and crosses into Weld County.

Each district is governed by an elected Board of Education that hires a superintendent. Boards generally meet on a regular schedule, with agendas and minutes posted online. Small portions of the county, such as parts of Erie and Broomfield-area addresses, sit near boundary lines, so use the district’s boundary lookup or the county assessor’s office to confirm which district serves your address. Boulder County is a mix of urban and suburban communities on the Front Range, plus rural plains and mountain areas, and that range shapes transportation and weather decisions.

Academic Calendar Structure

Both districts generally begin classes in mid-August and finish in late May or the first days of June. Boards approve calendars well ahead of time, often in the spring and sometimes more than a year in advance, so families can plan. Exact first and last days change annually, so rely on the current board-adopted calendar rather than a past year’s dates.

The fall semester generally ends near winter break, and the spring semester begins in early January. Secondary schools typically report by semester, with progress reports in between, while elementary schools may use trimesters or quarters. Your school’s handbook explains which applies and when report cards go out.

Colorado sets minimum instructional time mostly in hours: 1,080 for secondary students, 990 for elementary students, and 450 for half-day kindergarten, with a 160-day standard that hour-based calendars can satisfy. Both Boulder Valley and St. Vrain meet this with a conventional five-day week, in contrast to some small Eastern Plains districts that use four-day weeks. Bell times vary by school and level, and districts stagger start times to coordinate bus runs. Check your school’s page for exact times.

School Holidays and Breaks

Expect a familiar set of breaks, with details set by each board:

• Labor Day: first Monday of September, schools closed.
• Fall break: some districts schedule a few days off in October, often combined with parent-teacher conferences. Check each district’s calendar.
• Thanksgiving break: usually Wednesday through Friday or the full week.
• Winter break: typically about two weeks around Christmas and New Year’s Day.
• Martin Luther King Jr. Day: third Monday of January.
• Presidents’ Day: commonly a day off in February.
• Spring break: generally one week in March, often aligned across Front Range districts, though not always the same week.
• Memorial Day: last Monday of May.

Colorado does not mandate a list of school holidays beyond the instructional-time minimums, so each board decides. Dates shift every year, so use the current adopted calendar.

Comparing Calendars Across Colorado Counties

Families who relocate, share custody, or have relatives elsewhere in the state often need to line up two schedules. The Boulder County schools calendar reflects two large, fast-moving Front Range districts with mid-August starts, foothill and mountain weather, and Denver-area media for closure alerts. The Bent County schools calendar, by contrast, belongs to two small districts along the Arkansas River in southeastern Colorado, where long bus routes and prairie weather drive decisions. Reading them side by side shows how Colorado’s local control produces different weekly structures, break lengths, and weather policies, which helps anyone planning travel, childcare, or a move between the Front Range and the southeastern plains.

How to Find the Official Boulder County School Calendar

No single office publishes a countywide calendar, so go to the website of the district that serves your address: Boulder Valley School District or St. Vrain Valley Schools. Calendars are normally approved at a regular Board of Education meeting and then posted as a PDF or interactive calendar, often under tabs such as “Calendar,” “Families,” “Parents,” or “Community.” Many districts also offer a feed you can add to your phone’s calendar app.

Individual schools keep supplemental calendars for concerts, conferences, assemblies, and athletics. Check your child’s school page alongside the district calendar, since an event may appear on one and not the other.

Early Release Days, Teacher Workdays, and Professional Development

Teachers typically report several days before students for planning and training, usually in early to mid August. During the year, both districts schedule professional development days when students stay home, and some use early release or late-start days for staff collaboration, with frequency that varies by district and school. Families usually learn about these through the district calendar, school newsletters, automated calls, texts, and emails, and the student information portal.

Colorado requires certain staff training, including recognizing and reporting child abuse, but each district decides when to hold it.

Emergency Closures and Weather Days

Boulder County stretches from the plains to the Continental Divide, so weather varies sharply. Heavy spring snowstorms, strong downslope winds along the foothills, extreme cold, and wildfire risk all affect school operations. Mountain schools near Nederland and the canyon routes toward Lyons can face icy, closed, or slow roads when Boulder and Longmont see only light snow. The county has also dealt with major wildfires and flooding in recent years, which shows why districts plan for emergency closures beyond ordinary snow days.

The superintendent or a designee typically decides early in the morning after consulting transportation staff, road crews, and forecasts. Options include a full closure, a delayed start, an early release, or a shift to remote learning. Notices commonly go out through:

• Automated calls, texts, and emails from the district
• The district website, mobile app, and social media accounts
• Denver-area television stations such as 9NEWS, Denver7, FOX31, and CBS Colorado
• Local radio and newspapers serving Boulder and Longmont

Makeup policies vary. Some districts build extra time into the calendar so a few closures do not drop the year below the required hours, and some use remote learning days. Read your district’s weather policy to see whether a closure means a day off or an online assignment day.

Graduation and End-of-Year Schedule

High school final exams generally fall in the last week or so of May, followed by graduation ceremonies in mid to late May. Large high schools commonly hold ceremonies at stadiums, event centers, or the University of Colorado Boulder’s venues, while smaller schools may hold them on campus. Elementary and middle schools often hold promotion or recognition events in the final week. Final report cards and transcripts are generally available through the district parent portal after the term ends, though summer access varies.

Back-to-School and Registration Information

New families should first confirm which district serves their address. Colorado has school choice enrollment, and both districts run their own processes, so families can apply to schools outside their attendance area within district-set windows. Contact your district for dates.

Commonly requested documents include:

• Proof of residency, such as a lease, utility bill, or mortgage statement
• Proof of the child’s age, such as a birth certificate
• Immunization records or an approved exemption
• Records from the previous school, if transferring

Most districts offer online registration with help from a central enrollment office or the school. Supply lists are usually posted in July or early August, and schools often host open houses or meet-the-teacher events shortly before classes begin.

Special Programs and Their Calendar Implications

Several programs may follow different schedules. Both districts offer charter, specialty, and language immersion programs that can set their own calendars within district approval. St. Vrain Valley’s Innovation Center and Boulder Valley’s career and technical programs combine classroom and workplace learning, so check their schedules separately. Students in dual enrollment courses through Front Range Community College or the University of Colorado Boulder follow the college calendar for those classes, which can differ from the K-12 year. Alternative schools may run flexible hours, and Colorado’s Universal Preschool program serves four-year-olds with providers whose calendars may not match the K-12 year. Online options, whether district-run or statewide, may also follow different calendars.

Athletics and Extracurricular Calendar Context

High school athletics and activities are governed by the Colorado High School Activities Association (CHSAA), which sets season dates, eligibility rules, and postseason schedules. These are separate from the academic calendar but intersect with it. Fall sports begin in August around the first days of school, and winter and spring seasons overlap with exam periods and spring break. Larger schools have extensive programs, so evening and weekend events are common. Check athletic schedules separately.

State-Level Calendar Requirements and How Colorado Law Governs Boulder County

The Colorado Department of Education (CDE) administers state education law, and the State Board of Education adopts regulations. The state sets minimum instructional hours but leaves start dates, holidays, and weekly structure to local boards. That is why Boulder Valley RE-2 and St. Vrain Valley RE-1J can differ, and why both can differ from rural districts elsewhere in Colorado. Any nontraditional schedule must still meet the hour requirements. Questions about state rules can go to CDE.

Frequently Asked Questions

When does school start in Boulder County, Colorado?
Most schools begin in mid-August. The exact date depends on whether you live in Boulder Valley or St. Vrain Valley, so check that district’s current calendar.

When does school get out for summer in Boulder County?
Classes generally end in late May or early June, with high school graduations in mid to late May.

How many days are in a school year in Boulder County?
Colorado sets minimum instructional hours with a 160-day standard that districts can meet through hours. Each district’s adopted calendar shows its exact count.

How do I find out if school is cancelled today in Boulder County?
Check your district’s text, call, or email alerts, its website and social media, and Denver stations such as 9NEWS, Denver7, FOX31, and CBS Colorado.

What is the spring break schedule for Boulder County schools?
Spring break is usually one week in March, though the week can vary by district. Confirm it on your district’s adopted calendar.

How do I enroll my child in Boulder County schools?
Contact the enrollment office of the district that serves your address or use its online registration. Have proof of residency, proof of age, and immunization records ready.

Are there any year-round schools in Boulder County?
Most schools follow a traditional calendar with a summer break. Ask your district about any specialized or alternative programs that run differently.

Who do I contact about school calendar questions in Boulder County?
Start with your child’s school office, then your district’s central office. Board meeting agendas also show when calendars are adopted.