May is the earliest I ever get Hummingbirds up here in SW Wisconsin, so since you’re warmer than me, probably late April, early May.
If the feeder itself has a lot of red on it, they’ll find it! If the container is clear, make sure you at least start out with the red-colored liquid food for them, then you can switch to the homemade stuff once they know where your feeder is. (Homemade: Four cups water, 1 cup sugar. Heat through until all of the sugar is dissolved. Cool. Keep any extra in the fridge.)
Always keep the feeder filled and scrupulously clean. :)
Good information here on their migration and habits:
https://www.hummingbirdcentral.com/hummingbird-migration.htm
We keep our Humming Bird feeders up year around because Humboldt Bay is in their migration route north and south and there is one variety that is here year around