Yes Uttarakhand is open but with conditions..
you have to have negative COVID test Results + one week booking at hotel after 1 week only u can explore area.. rest u can check with Uttarakhand tourism site.
Get a test done and carry a COVID 19 negative test report. The report shall be considered only if you visit uttarakhand in the next 72 hours of the test. Also you need to have a reservation in any of the government listed hotels for a minimum of 7 days.