Well, I was a pool salesman for years, so I’m tempted to answer “RIGHT NOW AND I’LL BE RIGHT OVER.” But since I’m retired I’ll just give you a little advice. If you live in the Midwest, pool builders near you are already booking (or booked!) for spring installs, so you need to get on the list now for next season. An early start will enable you to finish your landscaping so you have the most time to enjoy the pool. Most reputable pool builders will have a pretty full schedule come spring, but once the season starts, you might get lucky and squeeze onto their schedule for an early summer installation. If the weather gets nice really early and installs run ahead, pool companies may even offer discounts to help fill in gaps in their schedules, but that’s a gamble. My best advice, if you want to be in the swim by summer, is BUY NOW. Fall and winter are the best times to make your decisions and get your pool installation scheduled for the spring.