Molly, is the salvia a frost sensitive one like the annual salvia splendens? I wait until spring is about to pop, for me that's late March or April. For you, it might be a couple of weeks earlier.
The problem with sowing now anything that's frost tender like salvia splendens, zinnias, marigolds is that if you get a couple of very warm days early (like that 70° you're getting Monday) they sprout and the cold returns, the seedlings can be killed off in the frost. If you wait until the weather is showing an actual warming trend, with warm days and nights above freezing, that's the best time to sow your frost-sensitive seeds.
We always get a couple of those late overnight frosts. Then I group all those jugs of just the tender plants together and cover with a blanket overnight for extra protection. Remove the blanket in the morning. It's actually easier for me to just wait a few weeks and sow them later.
Karen
