When To Go Generally, the peak season in the desert areas (southern Arizona) lasts from January through March with the next most popular season is from April to May and September through December and the season when visitors can find the greatest values is June through August. Peak and value seasons in the mountainous regions (northern Arizona) are the opposite of the desert areas. Generally, peak season is from June through August, shoulder season is April to May and September through December, and value season is January through March. Peak season in some mid-climate areas of the state, such as Sedona, is from March to May and September through October, with shoulder season from January to February. |