- 10/31/25: W26 information published
- 11/5/25: CS 121/ INF 141 and CS 141/ INF 101 restriction timeline has been updated
- 11/6/25: STATS 5 restriction timeline has been updated
Enrollment Restriction Dates
Winter 2026: Undergraduate Enrollment Restrictions
It is highly recommended that students check this page periodically. Course restrictions are subject to change.
ICS Student Affairs reserves the right to adjust restrictions and the timeline at any time.
The Registrar opens enrollment windows for students, which are set according to seniority levels.
ICS places additional restrictions for specific courses to prioritize students based primarily on their major, and sometimes also on seniority.
ICS restrictions organized by departments are also summarized here.
- The online listing will be updated by November 17th, 2025. Until then, refer to the General Catalogue for the most accurate and up-to-date prerequisite information.
- UCI Prerequisites
- Important: If you have satisfied any part of a course’s prerequisite(s) at another institution and you have not yet been cleared to enroll in that course, be sure to submit an Online Course Prerequisite Clearing request.
The School of ICS majors will have priority for seating in most School of ICS courses until 12:00pm, December 18th, 2025. See the detailed timeline for specific information.
- If a course is a core requirement for an ICS degree, first consideration is given to students in that major.
- If a course is a Specialization or Track requirement for an ICS degree, second consideration is given to students pursuing that Specialization or Track.
- If a course is a core requirement for a degree outside of ICS, a third consideration will be given to students in that major following the schedule outlined on this page.
- Majors outside the School of ICS may begin enrolling in ICS courses on December 18th, 2025, at 12:00pm.
- Quantitative Economics Juniors and Seniors will be able to enroll in STATS 120B from 12/1/25 until 12/4/25.
- Computer Engineering majors will be able to enroll in ICS 6D starting 12/5/25, at 12:00pm.
- CSE majors under the School of Engineering: if you meet the prerequisites but are unable to register in an upper-division CS course (100-189), contact ICS Student Affairs for assistance. (Note: INF courses (101-171) will be available to CSE majors beginning 12/5/25).
- Any non-ICS student found to be enrolled in ICS courses without permission from ICS Student Affairs before noon on 12/18/25 will be dropped.
- CS 142A
- CS 180A
- GDIM 167B/ ICS 169B
- ICS 31
- ICS 32
- ICS 33
- ICS 51
- ICS 53
- ICS 139W
- INF 191B
- STATS 170A
- Repeat restriction is in place for all School of ICS courses.
- If you plan to repeat a course, you can start enrolling in that course at 12:00pm on 12/5/25 .
On November 17th:
All IN4MATX courses are restricted to INF, and SE majors only except:
The following is open to School of ICS and CSE majors only:
- INF 43
The following are open to INF and SE Seniors only:
- INF 191A
- INF 191B
On November 26th at 12:00pm:
All IN4MATX courses are restricted to INF, SE, BIM, and GDIM majors only, except:
The following will remain open to School of ICS and CSE majors only:
- INF 43
The following courses are open to INF and SE Seniors only:
- INF 191A
- INF 191B
On December 5th at 12:00pm:
All IN4MATX courses will be open to School of ICS and CSE majors only, except:
The following courses will remain restricted to INF and SE Seniors only:
- INF 191A
- INF 191B
The Fee Payment deadline for Winter 2026 is Monday, December 15th, 2025 at 5:00pm.
- Any non-ICS student found to be enrolled in ICS courses without permission from ICS Student Affairs before noon will be dropped.
On December 18th, 2025, at 12:00pm:
All school/major restrictions are lifted from courses except:
- CS 180A (will remain restricted to CS majors only)
- GDIM 167B/ ICS 169B (will remain restricted to GDIM Seniors only)
- ICS 139W (will remain restricted to the School of ICS)
- INF 191A (will remain restricted to INF and SE Seniors only)
- INF 191B (will remain restricted to INF and SE Seniors only)
School of ICS reserves the right to extend or reinstate major restrictions on courses beyond this date.
Restriction Timeline by Course
| 11/17/2025 |
|
| COMPSCI courses are open to all School of ICS and CSE majors only, except:
The following are open to INF, CS, SE, and BIM majors only:
The following are open to School of ICS and School of Engineering majors only:
The following is open to CS, Upper-Division Standing only:
|
|
| 11/18/2025 |
|
| 9:00am: Upper-Division Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 11/24/2025 | |
| 9:00am:
Upper-Division Standing removed from most Upper-Division CS courses, The following courses will remain Upper-Division Standing only:
|
|
| 11/26/2025 | |
| 12:00pm:
The following course is open to INF, SE, BIM, and GDIM majors only:
|
|
| 12/5/2025 | |
| 12:00pm: The following courses will be open to School of ICS and CSE majors only:
12:00pm: Repeat restriction removed from all School of ICS courses. |
|
| 12/15/2025 | |
|
5:00pm: Fee payment deadline for the Winter 2026 quarter. Missing the fee payment deadline will result in you being dropped from Winter courses. |
|
| 12/18/2025 | |
|
12:00pm: School/Major restrictions are removed from most School of ICS courses:
The following will remain restricted to CS majors only:
|
|
| 12/19/2025 – 1/9/2026 | |
| Prerequisite sweeps will be conducted on all School of ICS classes. Any student who does not have the required course prerequisite(s) for a course WILL BE DROPPED from that course. | |
| 12/24/2025 – 1/1/2026 | |
|
Winter Recess Campus offices are closed |
|
| 1/5/2026 | |
| First day of Winter 2026 instruction. Students on the waitlist for any ICS course should be in contact with the instructor prior to the start of instruction. With instructor permission, make arrangements to ensure you can access course materials and submit any assignments in a timely manner while you are still on the waitlist. |
|
| 1/9/2026 | |
| 5:00pm:
Early Add, Drop, Change Grade Option deadline for the following course: CS 180A |
|
| 1/16/2026 | |
| 5:00pm
Add, Drop, Change Grade Option deadline: Last day to add, drop, or change grade option in WebReg for any ICS course. |
|
| 11/17/2025 |
|
CSE courses are restricted to CSE majors only:
|
|
| 12/5/2025 | |
| 12:00pm: The following will be open to School of ICS and CSE majors only:
|
|
| 12/15/2025 | |
| 5:00pm: Fee payment deadline for the Winter 2026 quarter
Missing the fee payment deadline will result in your being dropped from Winter courses. |
|
| 12/18/2025 | |
| 12:00pm:
WebReg reopens for continuing registration. School/Major restrictions are removed from most School of ICS courses:
|
|
| 12/19/2025 – 1/9/2026 | |
| Prerequisite sweeps will be conducted on all School of ICS classes. Any student who does not have the required course prerequisite(s) for a course WILL BE DROPPED from that course. | |
| 1/5/2026 | |
| First day of Winter 2026 instruction. Students on the waitlist for any ICS course should be in contact with the instructor prior to the start of instruction. With instructor permission, make arrangements to ensure you can access course materials and submit any assignments in a timely manner while you are still on the waitlist. |
|
| 1/16/2026 | |
| Add, Drop, Change Grade Option deadline, 5:00 pm
Last day to add, drop, or change grade option in WebReg for any ICS course. |
|
| 11/17/2025 |
|
GDIM courses will be open to GDIM majors only:
|
|
| 11/18/2025 |
|
| 9:00am: Upper-Division Standing only:
The following will remain Senior Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 11/24/2025 |
|
| 9:00am:
Upper-Division Standing restriction removed from Upper-Division GDIM courses. The following will remain Senior Standing only:
|
|
| 12/5/2025 |
|
| 12:00pm:
GDIM courses will be opened to the School of ICS only: The following courses will remain restricted to GDIM majors only:
12:00pm: Repeat restriction removed from all School of ICS courses. |
|
| 12/1/2025 |
|
| 12:00pm:
GDIM courses will be opened to GDIM & INF majors only. |
|
| 12/15/2025 | |
| 5:00pm:
Fee payment deadline for the Winter 2026 quarter Missing the fee payment deadline will result in your being dropped from Winter courses. |
|
| 12/18/2025 | |
| 12:00pm:
WebReg reopens for continuing registration School/Major restrictions are removed from most School of ICS courses:
The following will remain restricted to GDIM majors only:
|
|
| 12/19/2025 – 1/9/2026 | |
| Prerequisite sweeps will be conducted on all School of ICS classes. Any student who does not have the required course prerequisite(s) for a course WILL BE DROPPED from that course. | |
| 12/24/2025 – 1/1/2026 | |
|
Winter Recess Campus offices are closed |
|
| 1/5/2026 |
|
| First day of Winter 2026 instruction. Students on the waitlist for any ICS course should be in contact with the instructor prior to the start of instruction. With instructor permission, make arrangements to ensure you can access course materials and submit any assignments in a timely manner while you are still on the waitlist. |
|
| 1/16/2026 |
|
| 5:00pm:
Add, Drop, Change Grade Option deadline, Last day to add, drop, or change grade option in WebReg for any ICS course. |
|
| 11/17/2025 |
|
| I&C SCI restrictions vary by course:
The following courses are open to all campus majors:
The following are open to all School of ICS and CSE majors only:
The following courses are open to School of ICS majors only:
The following courses are open to INF, BIM, GDIM, and SE majors only:
The following courses are open to CS, DS, and SE majors only:
The following course is open to CS majors only:
The following courses are open to GDIM majors only:
|
|
| 11/18/2025 |
|
| 9:00am: Upper-Division Standing only:
The following will remain restricted to Senior Standing only
No changes made to the school/major restrictions set on 11/17/25 |
|
| 11/24/2025 |
|
| 9:00am: Upper-Division Standing removed from most ICS courses, except: The following course will remain Upper-Division Standing only:
The following course will remain Senior Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 12/5/2025 |
|
| 12:00pm:
The following course will be restricted to School of ICS, CSE, and CpE majors only:
The following courses will be restricted to School of ICS and CSE majors only:
The following courses will be open to the School of ICS only:
The following course will remain restricted to GDIM majors only:
12:00pm: |
|
| 12/15/2025 |
|
| 5:00pm:
Fee payment deadline for the Winter 2026 quarter Missing the fee payment deadline will result in your being dropped from Winter courses. |
|
| 12/18/2025 | |
|
12:00pm: School/Major restrictions are removed from most School of ICS courses.
The following will remain restricted to the School of ICS only:
|
|
| 12/19/2025 – 1/9/2026 |
|
| Prerequisite sweeps will be conducted on all School of ICS classes. Any student who does not have the required course prerequisite(s) for a course WILL BE DROPPED from that course. | |
| 12/24/2025 – 1/1/2026 |
|
|
Winter Recess Campus offices are closed. |
|
| 1/5/2026 | |
|
First day of Winter 2026 instruction. |
|
| 1/9/2026 |
|
| 5:00pm:
Early Add, Drop, Change Grade Option deadline for the following course:
Contact the instructor of the course to request permission to add or drop. |
|
| 1/16/2026 |
|
| 5:00pm:
Add, Drop, Change Grade Option deadline Last day to add, drop, or change grade option in WebReg for any ICS course. |
|
| 11/17/2025 |
|
| All IN4MATX courses are restricted to INF and SE majors only, except:
The following is open to School of ICS and CSE majors only:
The following is open to CS, CSE, INF, and SE majors only:
The following is open to CS, INF, SE, and BIM majors only:
The following are restricted to INF and SE, Upper-Division Standing only:
The following are open to INF and SE Senior Standing only:
|
|
| 11/18/2025 |
|
| 9:00am: All Upper-Division IN4MATX courses are restricted to Upper-Division Standing only, except: The following course will remain Senior Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 11/24/2025 |
|
| 9:00am: Upper-Division Standing removed from most Upper-Division IN4MATX courses, except:The following will remain Upper-Division Standing only:
The following will remain Senior Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 11/26/2025 |
|
| 12:00pm: All IN4MATX courses will be open to INF, SE, BIM, and GDIM majors only:The following will remain restricted to Upper-Division standing only:
The following courses’ restrictions remain unchanged as set on 11/17/25:
|
|
| 12/5/2025 |
|
| 12:00pm: All IN4MATX courses will be open to School of ICS and CSE majors only: The following will remain restricted to Upper-Division standing only:
The following will remain restricted to INF and SE Senior standing only:
12:00pm: Repeat restriction removed from all School of ICS courses. |
|
| 12/15/2025 |
|
| 5:00pm: Fee payment deadline for the Winter 2026 quarter
Missing the fee payment deadline will result in your being dropped from Winter courses |
|
| 12/18/2025 | |
| 12:00pm:
WebReg reopens for continuing registration. School/Major restrictions are removed from most School of ICS courses:
The following will remain restricted to INF and SE majors only:
|
|
| 12/19/2025 – 1/9/2026 |
|
| Prerequisite sweeps will be conducted on all School of ICS classes. Any student who does not have the required course prerequisite(s) for a course WILL BE DROPPED from that course. | |
| 12/24/2025 – 1/1/2026 |
|
|
Winter Recess Campus offices are closed |
|
| 1/5/2026 |
|
| First day of Winter 2026 instruction. Students on the waitlist for any ICS course should be in contact with the instructor prior to the start of instruction. With instructor permission, make arrangements to ensure you can access course materials and submit any assignments in a timely manner while you are still on the waitlist. |
|
| 1/9/2026 |
|
| 5:00pm:
Early Add, Drop, Change Grade Option deadline for the following course:
Contact the instructor of the course to request permission to add or drop. |
|
| 1/16/2026 |
|
| 5:00pm:
Add, Drop, Change Grade Option deadline Last day to add, drop, or change grade option in WebReg for any ICS course. |
|
| 11/17/2025 |
|
| STATS restrictions vary by course:
The following courses are open to all campus majors:
The following are open to School of ICS and CSE majors only:
The following are open to DS majors only:
|
|
| 11/18/2025 |
|
| 9:00am: Upper-Division Standing only:
The following course will remain Senior Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 11/24/2025 |
|
| 9:00am: Upper-Division Standing removed from most Upper-Division STATS courses.The following will remain Senior Standing only:
No changes made to the school/major restrictions set on 11/17/25 |
|
| 12/1/2025 |
|
| 9:00am: The following course will be open to the School of ICS only:
The following course will be open to DS and Q. Econ Juniors and Seniors only:
|
|
| 12/4/2025 |
|
| 12:00pm: The following will be open to the School of ICS only:
|
|
| 12/5/2025 |
|
| 12:00pm: Repeat restriction removed from all School of ICS courses |
|
| 12/15/2025 |
|
| 5:00pm: Fee payment deadline for the Winter 2026 quarter
Missing the fee payment deadline will result in your being dropped from Winter courses |
|
| 12/18/2025 | |
| 12:00pm:
WebReg reopens for continuing registration. School/Major restrictions are removed from most School of ICS courses:
The following will remain restricted to DS majors only:
|
|
| 12/19/2025 – 1/9/2026 |
|
| Prerequisite sweeps will be conducted on all School of ICS classes. Any student who does not have the required course prerequisite(s) for a course WILL BE DROPPED from that course. | |
| 12/24/2025 – 1/1/2026 |
|
|
Winter Recess Campus offices are closed |
|
| 1/5/2026 |
|
| First day of Winter 2026 instruction. Students on the waitlist for any ICS course should be in contact with the instructor prior to the start of instruction. With instructor permission, make arrangements to ensure you can access course materials and submit any assignments in a timely manner while you are still on the waitlist. |
|
| 1/16/2026 |
|
| 5:00pm:
Add, Drop, Change Grade Option deadline Last day to add, drop, or change grade option in WebReg for any ICS course. |
|