Growing asparagus from seed is an exercise in patience. After you're done planting asparagus seeds, it will be a long wait before you can harvest any actual asparagus spears to eat — the third year after starting the seeds!
Asparagus seeds are best started indoors under grow lights and should not be transplanted outdoors until they are 10-12 weeks past germination (sprouting), and all danger of last frost has passed. Asparagus seeds can take 2-8 weeks to sprout — plan accordingly!
Planting asparagus seeds means you will not begin to harvest any asparagus spears until year 3 after transplanting. And that first year of harvesting will be a light one to avoid damaging the plant and stunting its growth and future output.