Are you planning to visit Disneyland in 2018? When to go is the first decision! Here is a quick overview of the best times for 2018
Jan – Anytime after Jan 7th which concludes the Holidays
Feb – Go before the President’s Day crowds (the whole week Feb 19th)
March – Go Before Spring Break starts around March 20
April – Go After Spring Break concludes around April 8
May – Go But Skip Grad Nights which are every Friday and Saturday night in May
June, July, August – Avoid because Its Hot and Crowded
September – Go After Labor Day week
October – The Halloween Parties make this a crowded time
November – Go early before Thanksgiving week
December – If you must go in December, the last tolerable day is Dec 20th.

Star Wars Land opening in 2019, so this is probably the last uncrowded year for a few. But Disney is great at handling crowds, and you just need to be prepared.
Are you making plans for Disneyland this year?