3 Best Coffee Shops in Diamond Bar, California (2025 Guide)

The Mugs offers a blend of quality drinks and a thoughtfully designed space, featuring a half-circle layout that creates a welcoming atmosphere. Patrons appreciate its late closing hours for working or studying, with ample indoor seating and free parking nearby. Diners enjoy rich-flavored coffee and delicious sandwiches in an inviting setting.

Grid Coffee offers a cozy and comfortable atmosphere with ample seating, ideal for studying or relaxing. It serves a variety of caffeinated drinks like matcha lattes and coffee with sweet cream, complemented by unique toppings such as grapefruit. The menu includes vegetarian options and pastries like the delightful croffle, a combination of a croissant and waffle that's often served plain but also available in various flavors.

This charming little coffee shop offers a delightful selection of drinks, from classic favorites like dalgona coffee and Thai tea to more adventurous options like fruit smoothies and boba. Guests appreciate its warm, inviting atmosphere enhanced by colorful wall art featuring cute cat designs. The attentive service ensures fast and enjoyable experiences for all patrons, who consistently leave with positive feedback about their visits.