Yes, you can mix two cool season turf grass blends such as 5 Star Fescue Extreme Shade Mix and Pennington Annual Ryegrass. If Fescue is the main turf grass desired, be sure your Fescue to Rye ratio favors more on the fescue side.
Fescue is a cool season turf so may have trouble thriving in your climate. We recommend that you consult with your local county cooperative extension office Master Gardener for information on seeding and which will work best in your area.
Since the ideal timing for planting new grass seed such 5 Star Fescue Extreme Shade Mix can vary each year and by region due to weather patterns, the best resource to provide exact timing recommendations would be through the Master Gardener at your local County Cooperative Extension Office.
View our Cool Season Lawn Care Schedule and Fescue Lawn Article for general information on timing, weed control, fertilizing and herbicide applications.
The best way to determine what grass seed would grow and establish well in your area would be to speak to someone at your Local Master Gardener center for what will thrive in your weather and environments conditions.