1. The first step is to open Google Classroom and click a Class

2. Click the icon for settings.

3. Scroll down and click Add grading period row

4. Name the Grade Period.

5. Click Start date

6. Type Start date or use the calendar to add the date.

7. Click End date

8. Type End date or use the calendar to add the date. 

9. Click Add grading period to add another grading period. Add your grade period and dates.

10. Click Apply to existing assignments if you want to apply it to current classes.

11. Click Select Classes to copy the grade period to other classes.

12. Click the box next to the classes for the grade periods.

13. Click Select

14. Click Save

15. That's it. You're done.

Interactive tutorial