ISO Week · 2025 · Q4
Week 42
2025 · –
October · 4 working days · 81% through 2025
Week 42 of 2025 runs October 13, 2025 to October 19, 2025.
Week 42 starts on Monday, October 13, 2025 and ends on Sunday, October 19, 2025. It's the 286th day of the year, sits in Q4, and falls in October. By the end of this week, 292 of 365 days are gone, putting 2025 at 80%.
This week includes Columbus Day / Indigenous Peoples' Day, so it has 4 working days instead of the usual 5. Need a different week? Browse the full 2025 week calendar, or jump to this week's number.
Week 42 at a glance
The 7 days of week 42
Every date in week 42 of 2025, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 286 | Weekday | Columbus Day / Indigenous Peoples' Day | |
| Tuesday | Day 287 | Weekday | ||
| Wednesday | Day 288 | Weekday | ||
| Thursday | Day 289 | Weekday | ||
| Friday | Day 290 | Weekday | ||
| Saturday | Day 291 | Weekend | ||
| Sunday | Day 292 | Weekend |
What week 42 of 2025 means
ISO 8601 numbers weeks so every week starts on Monday and ends on Sunday. Week 1 is the one holding the year's first Thursday, which is why early January can land in week 52 or 53 of the previous year. Week 42 is one piece of that system.
In 2025, week 42 covers Oct 13 – Oct 19, 2025. That's October, deep in Q4. The same week number shifts by a day or two each year, so week 42 in 2026 won't share these exact dates. The table below shows how it moves.
Want to check a specific date instead of a week number? The week calculator converts any date to its ISO week. Curious how many weeks a year holds? The weeks in a year guide explains 52 versus 53. And the ISO week number page covers the standard end to end.
Holidays in week 42 of 2025
🇺🇸 United States
🇨🇦 Canada
Week 42 across years
The same ISO week number lands on different dates each year. Here's how week 42 shifts.
| Year | From (Mon) | To (Sun) | Notable | |
|---|---|---|---|---|
| 2024 | Columbus Day / Indigenous Peoples' Day | view → | ||
| 2025 THIS YEAR | Columbus Day / Indigenous Peoples' Day | |||
| 2026 | Columbus Day / Indigenous Peoples' Day | view → | ||
| 2027 | view → | |||
| 2028 | view → |
Week 42 of 2025: questions and answers
What days are in week 42 of 2025?
Week 42 of 2025 runs from October 13, 2025 (Monday) through October 19, 2025 (Sunday). It spans October.
What month is week 42 in 2025?
Week 42 of 2025 falls entirely in October 2025.
How many working days are in week 42 of 2025?
Week 42 of 2025 has 4 working days — reduced from 5 due to Columbus Day / Indigenous Peoples' Day falling on a weekday.
What week is Columbus Day / Indigenous Peoples' Day in 2025?
Columbus Day / Indigenous Peoples' Day falls in ISO week 42 of 2025 (Oct 13 – Oct 19, 2025).
What quarter is week 42 of 2025 in?
Week 42 of 2025 is in Q4 (2025). The week starts on day 286 of 365.
What is ISO week 42?
ISO week 42 is defined by the ISO 8601 international standard. It begins on Monday, October 13, 2025, and ends on Sunday, October 19, 2025. It is week 81% through the ISO year 2025.