Oxford full terms start on Sundays (unlike Cambridge). Lectures etc start on Mondays (unlike Cambridge). I think compulsory residence starts on the Thursday of 0th week = the week before full term starts. Often exams take place on these days.
Many colleges have conference trade arriving immediately at the end of term, so often there is very little flexibility with drop off and collection deadlines. Depending on course and party schedule, sometimes you can pick them up on the day before.
The exact times/dates that they have access to their college rooms, will depend on their residence contract. In ds1's college, 1st years could return on the Tuesday of 0th week each term, I think.
I have one at each of O and C: it can be quite a learning curve!
ds1 (Oxford) seems to lose the ability to use a regular calendar during termtime and just refers to "Thursday of 4th week" or " Monday of 6th"....?! This doesn't seem to happen at Cambridge at all.
At Cambridge full term - ie lectures - always start on a Thursday. In ds2's college, the residency contract always ran from the previous Sunday or Saturday. (But he often had exams, and tutorials before full term started.)
AMA