Simple ScheduleMt. Diablo Unified 2026-2027 School Calendar Holidays, breaks, and no school days
Next no-school day
Friday
October 9
Indigenous People's Day (Observed)
No-school days
28 weekdays
10 single days + 18 break days
First day
Monday
August 24
2026
Last day
Friday
May 21
2027
School year at a glance
Today First Day Last Day No School Break School Day
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30 | 31 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27 | 28 | 29 | 30 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27 | 28 | 29 | 30 | 31 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | |||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| 31 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 | 31 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 |
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30 | 31 |
Longer breaks
Winter Break
Thu, Dec 17 – Mon, Jan 4
19 days off
13 school + 6 weekend days
Spring Break
Sat, Mar 20 – Sun, Mar 28
9 days off
5 school + 4 weekend days
All 2026-2027 dates
No-school days, breaks and schedule changes, month by month.
August 2026
- Teacher Workday No school
- Teacher Workday No school
- First Day of School First day
September 2026
- Labor Day No school
October 2026
- Indigenous People's Day (Observed) No school
- College Now Holiday No school
November 2026
- Veterans Day No school
- Thanksgiving No school
- Day After Thanksgiving No school
December 2026
- Winter Break Break
January 2027
- Martin Luther King Jr. Day No school
February 2027
- College Now Holiday No school
- Presidents' Day No school
March 2027
- Spring Break Break
April 2027
- College Now Holiday No school
May 2027
- Last Day of School Last day
- Teacher Workday No school
- Teacher Workday No school
- Memorial Day No school
June 2027
- Teacher Workday No school
Schools using this calendar
52 schools follow the Mt. Diablo Unified calendar.
Browse all schools (A–Z)
A
Ayers Elementary
B
Bancroft ElementaryBel Air Elementary
C
Cambridge ElementaryCollege Park HighConcord HighCrossroads High
D
Delta View ElementaryDiablo Community DayDiablo View Middle
E
Eagle Peak MontessoriEl Dorado MiddleEl Monte Elementary
F
Fair Oaks ElementaryFoothill Middle
G
Glenbrook AcademyGregory Gardens Elementary
H
Hidden Valley ElementaryHighlands ElementaryHolbrook Language AcademyHorizons School: Independent Study
M
Mdusd PreschoolsMeadow Homes ElementaryMonte Gardens ElementaryMountain View ElementaryMt. Diablo ElementaryMt. Diablo High
N
Northgate High
O
Oak Grove MiddleOlympic Continuation High
P
Pine Hollow MiddlePleasant Hill ElementaryPleasant Hill MiddleProspect High (Continuation)
R
Rio Vista ElementaryRiverview Middle
S
Sequoia ElementarySequoia MiddleShore Acres ElementarySilverwood ElementaryStrandwood ElementarySun Terrace ElementarySunrise (Special Education)
V
Valhalla ElementaryValle Verde ElementaryValley View Middle
W
Walnut Acres ElementaryWestwood ElementaryWoodside ElementaryWren Avenue Elementary
Y
Ygnacio Valley ElementaryYgnacio Valley High
Frequently Asked Questions
When is there no school at Mt. Diablo Unified in 2026-2027?
There's no school at Mt. Diablo Unified on 16 single days in 2026-2027: Monday, August 3 (Teacher Workday); Tuesday, August 4 (Teacher Workday); Monday, September 7 (Labor Day); Friday, October 9 (Indigenous People's Day (Observed)); Friday, October 16 (College Now Holiday); Wednesday, November 11 (Veterans Day); Thursday, November 26 (Thanksgiving); Friday, November 27 (Day After Thanksgiving); Monday, January 18 (Martin Luther King Jr. Day); Friday, February 12 (College Now Holiday), and six more. Breaks: Winter Break (Thursday, December 17 to Monday, January 4) and Spring Break (Monday, March 22 to Friday, March 26).
When is the first and last day of school at Mt. Diablo Unified in 2026-2027?
The first day of school at Mt. Diablo Unified is Monday, August 24, 2026. The last day of school is Friday, May 21, 2027. That's a school year of about 39 weeks.
How many school days are in the 2026-2027 school year at Mt. Diablo Unified?
About 167 school days: the weekdays from the first day to the last day, minus days off.
How many days off does Mt. Diablo Unified have in 2026-2027?
About 28 weekdays with no school, not counting weekends or summer. That's 18 weekdays of breaks plus ten single days off. There are also eight long weekends, where a Friday or Monday off joins the weekend.
What is the longest break at Mt. Diablo Unified in 2026-2027?
Winter Break is the longest: 19 days in a row with no school, from Thursday, December 17 to Monday, January 4, including weekends (13 school days off).
What is the longest stretch of school without a day off?
Thirty school days in a row (about six weeks), from Monday, April 12 to Friday, May 21.
Which month has the most days off at Mt. Diablo Unified?
December has the most, with 11 weekdays off.
Counts are approximate and based on the published calendar.
Source: Mt. Diablo Unified, last updated Oct. 2026. Dates can change, so confirm with the school before making plans.
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