Recommended planting dates vary by your growing zone, so many companies don't include a recommended planting date range. It's easy to figure out on your own, however. You need to gather a little bit of info, but we can help you!
Here is how to figure out your recommended planting dates based on your zone:
1. Start by knowing what growing zone you are in, which you can do here.
2. Find your average last frost date for your location. You can find that here.
3. Count backwards 6 to 8 weeks. That is the date range in which you should start your seeds indoors.