For a city of around 130,000 people, there's an incredible density of coworking spaces across Chiang Mai. While the area of Nimman has the highest concentration, you'll find options spread across the city. I opted for Nim Space, which I've written about further below.
The sheer abundance of coffee shops, many of which are open until 22:00 and beyond, present viable options for getting work done, with most offering Wi-Fi access with purchases.
Many of the spaces are smaller than what you'd find in a major city and can reach capacity quickly. If you're working European hours and starting later in the day, you may struggle to find a hot desk, as venues often fill up during morning hours. If you have your eyes on a certain space, enquire as far in advance as possible, especially if travelling during the high season.
I have a tendency to agonise over finding the right place to work from, so I visited several options during my first week:
Yellow - The largest and most famous. I had a quick scan around but something didn't quite click with it for me. Something about the space felt somewhat depressing. The air conditioning wasn't particularly strong, the interior felt a little tired and you could sense the potential for the desk space reaching an uncomfortable capacity. One of the more expensive options where the premium didn't quite seem worth it. Worth popping by, but keep in mind there are (numerous) alternatives.
Alt_ChiangMai (Old City) - Stylish, quiet, professional space in a particularly peaceful street within the Old Town. I would have signed up on the spot, but they were at capacity until the second week of January. They have another site closer to the Ping River on the other side of town which is also worth considering.
The Brick - Would have happily worked from here, but the hot desks were all full by 1pm. Worth considering if starting early in the day and don't need the security of a consistent desk.
CAMP - The Maya Shopping Centre features a free coworking facility on its top floor, which is popular with local students, with two hours of internet provided with a drink purchase. For a free space, it's impressive. But as it's deathly quiet and if you'll be on calls throughout the day, it's not a viable option. A handy option if you need somewhere to focus for a few hours.
Buri Siri Hotel - I ended up working from here for a day over the New Year holiday while a lot of places were closed. For a very reasonable 150 THB (£3.60) you get a day of coworking and a complimentary drink. Wouldn't consider it for long-term but absolutely fine for a day, plus you can pay a small surcharge to use the pool. Food from the restaurant was tasty and reasonable value.
Punspace Tha Phae Gate - Realistically this was too far from Nimman for a daily walk but it looked a large, airy and spacious option with solid reviews online. Worth checking out if in the area.