I agree with HGL81, it's more likely to be a lifestyle change than nap.It is very rare for a a child under 3 to no longer need to nap (read too many sleep books).
My 3yo girl goes to bed at 7-730. Up around 6am. Has 1.5-3.5 hr nap during the day (usually around 1pm but varies according to what we are doing)
There have been phases when she's been difficult to get to sleep and others have told me to drop the nap- but I need that nap, and we have always riden it out and she goes back to her old routine.
Don't forget daylight saving ends in a month too, so that makes it an hour earlier lol!