To put things simply, there is no set level at which Vulpix evolves into Ninetales in Pokemon Sword and Shield, and players are essentially free to initiate the transformation whenever they wish.

What level should you evolve Vulpix sword?

WeeSingInSillyville notes that the Vulpix found in Route 3 range from about levels 9-12. You can evolve one as soon as you have the Fire Stone, so you can rock a level 10 Ninetales.

What level should I evolve Vulpix Gen 1?

But bring it up to Level 42, and it will know the dreaded Flamethrower and learn Fire Spin, one of the few multi-turn "lock-down" techniques (your enemy cannot retaliate while the attack lasts). Once you have reached Level 42, it's time to evolve this harmless looking fox into the impressive Ninetales .