Which Classes Fill Up Fastest at Chaffey College?
In 2026 Fall, 85% of Chaffey’s 2,236 class sections filled up. The classes most likely to be full were BIOL 20, CHEM 10 and ETHN 1.
At their longest, waitlists across Chaffey’s sections added up to 15,336 spots.
Online sections filled more often than in-person ones: 73% of in-person sections vs 94% of online sections.
The 30 classes that fill up fastest at Chaffey
- 35 of 35 sections full · 574 on waitlists
- 35 of 35 sections full · 545 on waitlists
- 34 of 34 sections full · 417 on waitlists
- 19 of 19 sections full · 270 on waitlists
- 18 of 18 sections full · 258 on waitlists
- 22 of 22 sections full · 253 on waitlists
- 23 of 23 sections full · 240 on waitlists
- 24 of 24 sections full · 206 on waitlists
- 19 of 19 sections full · 174 on waitlists
- 9 of 9 sections full · 164 on waitlists
- 25 of 25 sections full · 158 on waitlists
- 19 of 19 sections full · 148 on waitlists
- 9 of 9 sections full · 137 on waitlists
- 9 of 9 sections full · 133 on waitlists
- 7 of 7 sections full · 131 on waitlists
- 14 of 14 sections full · 123 on waitlists
- 15 of 15 sections full · 120 on waitlists
- 13 of 13 sections full · 116 on waitlists
- 12 of 12 sections full · 116 on waitlists
- 14 of 14 sections full · 113 on waitlists
- 5 of 5 sections full · 96 on waitlists
- 15 of 15 sections full · 91 on waitlists
- 11 of 11 sections full · 89 on waitlists
- 9 of 9 sections full · 85 on waitlists
- 15 of 15 sections full · 84 on waitlists
- 4 of 4 sections full · 80 on waitlists
- 11 of 11 sections full · 78 on waitlists
- 10 of 10 sections full · 74 on waitlists
- 5 of 5 sections full · 73 on waitlists
- 4 of 4 sections full · 70 on waitlists
Only classes with two or more sections are ranked. The waitlist number adds up each section’s waitlist at its longest, so a student waiting on two sections counts twice.
How we measured this
We checked every section in Chaffey’s 2026 Fall class schedule repeatedly from Tuesday, June 30, 2026 to Friday, October 9, 2026. A section counts as full if any check found its enrollment at the seat limit or anyone on its waitlist. Cancelled sections and sections without a seat limit are left out. Classes that filled before our first check still count, because they were still full when we looked.
Questions students ask
What classes fill up fast at Chaffey?
In 2026 Fall, the classes most likely to be full at Chaffey were BIOL 20 (Human Anatomy), CHEM 10 (Introductory Chemistry), ETHN 1 (Intro to Ethnic Studies), BIOL 1 (General Biology) and BIOL 22 (Human Physiology). Overall, 85% of Chaffey’s class sections filled up.
How do I get into a full class at Chaffey?
Get on the waitlist as soon as you can, check your email through the first week for a permission number or add code, and go to the first class meeting. Instructors often add waitlisted students who show up, as other students drop.
When should I register at Chaffey to get the classes I need?
At your registration appointment, the first minute it opens. Spring 2027 registration at Chaffey opens Monday, November 2, 2026 for continuing students. Have a backup section picked for every class on this list.
Not sure which classes to register for? On our platform, put in Chaffey and the university you want to transfer to, and you get the classes you need, semester by semester. Build your class plan.