Jiuzhaigou's low season is 12-4月. While the weather isn't peak-perfect, the big wins are fewer crowds and lower prices. Attractions have no queues, hotels run 50-70% off peak rates, and flights often have 30-50% discounts. If you dislike crowds, low season can be the better choice.
Low-season caveats: ① Some attractions may have reduced hours or maintenance — check official sites before going; ② Weather is variable — bring rain gear and warm layers; ③ Seasonal events (like 藏历新年) may not run; ④ Restaurant and shop hours may shift. But core sights like 九寨沟 and 五花海 stay open year-round.
Low-season perks: 诺日朗瀑布 at dawn is nearly empty — you can have it to yourself. Tibetan Hotpot spots have no queues. You can upgrade to a better hotel for less than a standard room in peak season. Watch for airline sales and lock in low fares early.