The Ithaca Police Department FAQ states:

"Effective November 1 through April 1 of each year no person shall park a vehicle between 2:00 A.M. and 6:00 A.M. on the odd-numbered side of all City streets on the odd-numbered days of the calendar month, and on the even-numbered side of all city streets on the even-numbered days of the calendar month." (emphasis added)

In practice, this generally means that in the evening one should park on the even side of the street on even-numbered days, and the odd side of the street on odd-numbered days. (Because enforcement of the rule will occur in the early morning hours of the following day.)

However, there are two cases where this rule of thumb does not work and can lead to confusion:

1. Parking after midnight (in which case you must park on the odd side on even days, and the even side on odd days)
2. Parking on the last night of a month that has a 31^st day (in which case the following day, the 1^st, is still odd and therefore you must park on the even side.)

When in doubt, stop on by whichsidetopark.info and have a computer figure it out for you!