SNU's academic year begins at March and ends at the next February. An academic year has two regular semesters of spring and fall which are 16 weeks long, and two of six-weeks sessions during summer and winter breaks.
| MARCH | 1 | Independence Movement Day (national holiday) |
| 16 | Spring semester begins | |
| 9 - 20 | Course add and drop period | |
| 9 - 20 | Course demand survey for summer session | |
| 9 - 20 | Application period for faculty to open fall semester courses | |
| 23 - 27 | Application period for faculty to open summer session courses | |
| APRIL | 6 - 10 | Application period for double major and combined major |
| 7 | First quarter of spring semester ends | |
| 15 | The Assembly election (national holiday) | |
| 20 - 24 | Application period for minor, interdisciplinary minor, and student-designed major | |
| 30 | Buddha’s Birthday (national holiday) | |
| MAY | 4 | Second quarter of spring semester ends, Last day to withdraw from courses |
| 5 | Children’s Day (national holiday) | |
| 7 - 8 | Reading period | |
| 7 - 13 | Registration for summer session courses | |
| 25 - June 12 | Application period for fall semester scholarships | |
| 28 | Third quarter of spring semester ends | |
| JUNE | 19 | Spring semester classes end |
| 22 - July 24 | Application period for re-admission and re-enrollment | |
| 22 - Aug. 31 | Application period for re-registration | |
| 22 | Summer break begins, Summer session classes begin | |
| JULY | 3 | Last day for faculty to submit spring semester grades |
| 10 | Last day to withdraw from summer session courses | |
| 31 | Summer session classes end | |
| AUGUST | 3 - 7 | Tuition payment period for newly admitted graduate students |
| 7 | Last day for faculty to submit summer session grades | |
| 13 - 19 | Registration for fall semester courses (08:30 ~ 16:00) | |
| 24 - 28 | Tuition payment period for fall semester | |
| 28 | Summer graduation ceremony | |
| 31 | Summer break ends, spring semester ends | |
| SEPTEMBER | 1 | Fall semester begins |
| 1 | Fall semester classes begin | |
| 1 - 7 | Course add and drop period | |
| 7 - 11 | Course demand survey for winter session | |
| 7 - 18 | Application period for faculty to open next spring courses | |
| 21 - 25 | Application period for faculty to open winter session courses | |
| 24 | First quarter of fall semester ends | |
| OCTOBER | Sep.30 - 2 | Chuseok (national holiday) |
| 9 | Hangeul Day (national holiday) | |
| 12 - 16 | Application period for double major and combined major | |
| 15 | SNU Anniversary (no class) | |
| 26 | Second quarter of fall semester ends, Last day to withdraw from fall semester courses | |
| 26 - 30 | Application period for minor, interdisciplinary minor, and student-designed major | |
| 29 - 30 | Reading period | |
| NOVEMBER | 5 - 11 | Registration for winter session courses |
| 19 | Third quarter of fall semester ends | |
| 23 - Dec. 11 | Application period for spring semester scholarships | |
| DECEMBER | 11 | Fall semester courses end |
| 12 - 18 | Make-up classes | |
| 14 - Jan. 15, 2021 | Application period for re-admission and re-enrollment | |
| 14 - Feb. 26, 2021 | Application period for re-registration | |
| 21 | Winter break begins | |
| 21 | Winter session classes begin | |
| 25 | Christmas (national holiday) | |
| 28 | Last day for faculty to submit fall semester grades | |
| 2021 JANUARY |
1 | New Year Day (national holiday) |
| 7 | Last day to withdraw from winter session courses | |
| 11 - 15 | Application period for department transfer | |
| 22 | Winter session courses end | |
| 28 - Feb. 3 | Registration for spring semester courses(08:30 ~ 16:00) | |
| 29 | Last day for faculty to submit winter session grades | |
| FEBRUARY | 1 - 5 | Tuition payment period for newly admitted graduate students |
| 2 - 4 | Tuition payment period for newly admitted undergraduate students | |
| 11 - 13 | Seol (national holiday) | |
| 19 - 25 | Tuition payment period for spring semester | |
| 26 | Winter graduation ceremony | |
| 26 | Winter break ends, fall semester ends |
* The schedule is subject to change as appropriate