Pool maintenance by region.

Covers the desert Southwest (Arizona, Nevada, New Mexico), defined by low humidity, intense sun, and wide day-to-night temperature swings. Pool season runs nearly year-round in the lowest-elevation cities, and heating can extend swimmable months even further. The #1 maintenance consideration is evaporation and water loss: dry air and high heat pull water down fast, so refill frequency and water cost matter more here than in almost any other zone.

Covers the Gulf Coast and humid Southeast, plus Hawaii, where heat and moisture combine to create near-constant algae and bacterial growth pressure. Pool season stretches from a solid 7-8 months at the zone's northern edge to genuinely year-round in Florida, coastal Texas, and Hawaii. The #1 maintenance consideration is staying ahead of algae and organic contamination, since warm, humid air and frequent heavy rain keep chlorine demand high and dilute chemistry after storms.

Covers the Pacific Coast states, ranging from Southern California's dry, sunny, near-year-round warmth to the Pacific Northwest's cooler, cloudier, rain-driven mild seasons. Season length varies more within this zone than any other: effectively year-round with heating in Southern California, but a compact 5-6 months in Oregon and Washington. The #1 maintenance consideration is that regional variation itself: what counts as normal pool care differs sharply between coastal Southern California and the cool-summer, rainy Pacific Northwest.

Covers the mid-Atlantic and Ohio Valley states, where all four seasons are distinct but winters are moderate rather than brutal. Pool season is a clear 4-6 month window, generally April or May through September, bookended by real spring-opening and fall-closing rituals. The #1 maintenance consideration is the seasonal transition itself: proper opening and closing procedures, plus winterizing exposed plumbing, matter far more here than in warmer zones.

Covers the Northeast, the industrial Midwest, and the Mountain states, where winters bring hard, reliable freezes and pool season compresses to a firm summer window. Most owners work within roughly a Memorial-Day-to-Labor-Day rhythm, about 4-5 months, with real risk of freeze damage to any plumbing left unprotected. The #1 maintenance consideration is thorough winterization: blowing out lines and protecting equipment against a hard freeze isn't optional, it's the difference between a pool that survives winter and one that needs expensive spring repairs.

Covers the far northern tier of the Lower 48 and Alaska, where winters are severe and the swimmable season compresses to as little as three months. In-ground pool ownership is genuinely uncommon across much of this zone; where pools exist at all, above-ground and seasonal installs are common alternatives to a full in-ground build. The #1 maintenance consideration is committing to a serious, non-optional winterization project every fall, since a hard freeze here can destroy unprotected plumbing and equipment outright.