For some vegetables, it's exactly right; for others, it's still a bit early.
Sacramento is in Sunset Climate Zone 14. For more information on Zone 14, look for the Sunset Western Garden Book at your local library or local garden-supply store. It's an invaluable resource for gardening in the western United States & Canada and will help you select varieties/cultivars more likely to succeed in your specific zone, as well as their planting dates, water needs, soil requirements, and so on.
And welcome to The Helpful Gardener!
Sunset Zone 17, USDA Zone 9