Best Time to Visit Chiang Mai

Every year from roughly mid-February to mid-April, farmers across northern Thailand, Myanmar and Laos burn fields after harvest, and forest fires break out in the dry hills, including on Doi Suthep itself. The smoke settles in Chiang Mai’s valley, and on many days in March the city has one of the highest PM2.5 readings of any city on earth. Daily averages of 100 to 200 micrograms per cubic metre are common at the peak, against a World Health Organization guideline of 15. The mountain disappears from view, the sun turns orange, flights are sometimes delayed, and some local schools close.

• Temples and the Old City: November to February. In the hot season, visit temples before 10am and after 4pm; in the rainy season, mornings are usually dry.
• Trekking and hill-tribe villages: November to February is the classic window, with dry trails and clear views. October and early March work too, and the forests around Chiang Dao and Doi Chiang Dao are the main alternative to the Doi Inthanon routes. Treks still run in the rainy season but trails are muddy, leeches appear and some routes close.
• Doi Inthanon: for cold and clear skies, December and January, when the summit at 2,565 m can drop to 0 to 5°C before dawn and frost sometimes forms on the grass. The Kew Mae Pan nature trail near the summit closes every year from June to October, so the best views come from November. Wild Himalayan cherry blossoms turn the hillsides pink from mid-January to early February. Bring a fleece; the twin royal chedis at sunrise are bitterly cold.
• Waterfalls: the end of the rainy season, September to November, when Wachirathan Falls, Mae Sa Waterfall and the Bua Thong “sticky waterfall” north of the city are full but trails are drying out. By March many smaller falls are a trickle.
• Rice terraces and green landscapes: August to October for green paddies around Mae Chaem and the valleys west of Doi Inthanon, with the golden harvest in late October and November.
• Elephant sanctuaries and cooking classes: any month. Sanctuaries in the Mae Taeng valley are greener and less crowded in the rains.
• Motorbike loops: November to February for the Samoeng Loop and the road to Pai, which has 762 bends and is slippery and landslide-prone in heavy rain.
• White-water rafting: July to November on the Mae Taeng river, when water levels are high enough.
• Birdwatching: December to February on Doi Inthanon, when winter migrants join the resident species.

Lunar festivals move every year. Dates below are for 2026 and 2027 where they are fixed or announced; confirm with the Tourism Authority of Thailand before you book flights around one.

• January: Bo Sang Umbrella Festival in the craft village of Bo Sang towards San Kamphaeng, usually the third weekend, with parades of hand-painted parasols.
• February: the Chiang Mai Flower Festival on the first weekend of the month, with a Saturday-morning parade of flower-covered floats from Nawarat Bridge to Suan Buak Haad park, where displays and stalls run all weekend. Expect it around 5 to 7 February 2027.
• April: Songkran, the Thai New Year, officially 13 to 15 April, though in Chiang Mai the water fight runs for four or five days. The moat road around the Old City is the epicentre, the Phra Buddha Sihing image is paraded from Wat Phra Singh for blessing, and nobody on the street stays dry. Book transport and rooms early.
• May: on the eve of Visakha Bucha, tens of thousands of pilgrims walk the 12 km road up to Doi Suthep overnight. The Inthakhin city-pillar festival at Wat Chedi Luang follows in late May or early June.
• July to October: Buddhist Lent, quiet and rainy, with temple fairs on its first and last days.
• November: Yi Peng and Loy Krathong, the high point of the year (below).
• December: cool-season fairs, the Chiang Mai Red Cross Winter Fair in the city park, and New Year’s Eve countdowns at Tha Phae Gate.

Yi Peng, the Lanna festival of lights, coincides with Loy Krathong on the full moon of the twelfth Thai lunar month. In 2026 the full moon is 24 November, and Chiang Mai’s celebrations normally run for about three nights around it, roughly 23 to 25 November; in 2027 Loy Krathong is expected around 14 November. On those nights the city hangs paper lanterns over the streets and temples, monks light candles and lanterns at Wat Phan Tao and Wat Lok Molee, people float krathong (banana-leaf baskets with candles) on the Ping River, and a parade of illuminated floats crosses the city towards Tha Phae Gate.

The famous mass release of thousands of sky lanterns is not a free street event. Lantern releases in the city are restricted for air-traffic safety, and flights at Chiang Mai airport are rescheduled during the main release hours. The big releases happen at ticketed events outside the city that cost several thousand baht and sell out months ahead; check that any event you book is officially permitted. Hotel rates around the Old City and the river can triple that week, so book rooms three to six months ahead.

High season (November to February): most visitors, highest prices. Rooms cost 20 to 40 percent more than in the rains, and the Yi Peng week, Christmas, New Year and Chinese New Year (6 February 2027) bring the peaks, with central hotels full and Doi Suthep crowded by 9am. Book tours, sanctuaries and the overnight train from Bangkok a week or more ahead.

Shoulder (late February, October): late February is still dry and often only lightly smoky, with fewer people; October is green, mostly dry by the second half, and cheaper.

Burning season (March to mid-April): hotels discount and many long-stayers leave. Songkran week is the exception, with domestic tourists filling the city.

Low season (May to September): rates drop by up to a third, walk-ins are easy and the city belongs to locals and students. You lose some afternoons to rain and a few trekking routes, not the trip.

In the cool season, pack a fleece or light jacket for early mornings, the night train and any trip to Doi Inthanon or Doi Suthep, plus a warm layer for a trek that sleeps in a hill village. In the hot season, bring loose cotton clothing, a sun hat, high-factor sunscreen and a few N95 masks, and plan to buy more. In the rainy season, a light rain jacket, quick-dry clothes and sandals that grip on wet temple steps are enough; leave the umbrella in your bag for the afternoon storm. Year-round, bring something that covers shoulders and knees for temple visits and insect repellent for the hills. For the whole-country picture, see our best time to visit Thailand guide.