This is from the website: On Thanksgiving Day (Thursday, November 23), the Red Rock Canyon National Conservation Area Scenic Drive will be open with reduced hours from 6AM to 12PM. The Visitor Center will close early as well and will be open from 8AM to 12PM.
Answer given by Grace Cage is correct. You can check their web site.
It will be open as follows: Scenic Drive: 6 am - 12 pm Visitor Center: 8 am - 12 pm
Yes it's open, reduced hours
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