Just be patient Andi, it depends on what kind of seeds you've sown. A lot of mine show up through April and then some stragglers in May or June.
More germination today! What a lift those little green babies are right now! Today I noted 1 seedling in each jug of magenta Hollyhocks and Charmer Salmon Flax, and several in jugs of yellow Mexican Hat, Elecampane, and pink and white Digitalis.