No, Chamonix is no longer on lockdown! Chamonix entered lockdown on March 17th 2020 together with the rest of France. As coronavirus cases dwindled, the French government started to take the first steps on what they call 'déconfinement' or their plan to ease lockdown, which began on May 11th. They created a map that divides the country into red and green departments based on the level of circulation of the virus, pressure on hospitals and intensive care units, and the ability to test for Covid-19. Chamonix is situated in a green region, meaning that the virus is less active here.
Chamonix has completed the 'déconfinement'. This means that most borders are open and transport is operating normally (although masks must be worn on public transports). Face masks are obligatory in all enclosed spaces, including bars and restaurants (although it can be removed while drinking and eating), shops, hotels, sports centres (it can be removed while practising sports), mountain refuges, cinemas, libraries, etc.
Face masks also mandatory in Chamonix's town centre, including the following streets (see map): Rue du Docteur Paccard, Rue Joseph Vallot, Place Balmat, Rue des Moulins, Place Saussure, Quai d'Arve, Quai du Vieux Moulin, Avenue Michel Croz, Avenue Ravanel le Rouge, Avenue de la Aiguille du Midi (including the Aiguille du Midi square), Place de la Eglise, Place du Triangle de l'Amitié, Place d'Aspen, Avenue du Mont-Blanc, Place du Mont-Blanc, rue Whymper, Passerelle du Montenvers and Place de la Mer de Glace.
Gatherings of up to 10 people are also possible, as are outdoor sports. Plenty of public spaces are now open, including beaches, lakes, sports centres, swimming pools, forests, gardens, parks, open-air markets, schools, theatres and museums. Social distancing, safety and hygiene measures must remain firmly in place.
Cafes, bars, restaurants, hotels and campsites have also been able to reopen on June 2nd albeit with restrictions: there can't be more than 10 people per table, which must be separated by a distance of at least 1m between, while both staff and customers have to wear masks, although it can be removed while eating and/or drinking. Gatherings of more than 5,000 people won't be authorised before September 2020.