Dry the seeds
Arrange a layer of paper towels, paper plates, or wax paper on top of a cookie sheet. Then, dump the clean seeds onto the sheet. Spread them out so that they rest on the sheet in a single layer.
Make sure they’re not touching. This will help them dry more quickly and thoroughly. Set the tray of seeds in a cool, dry area. It should take about a week for them to dry completely.
At least once a day, stir them around and flip them over to speed up the process and allow both sides to dry. If you see any mold growth, your storage space must not be cool or dry enough.
Store the seeds in an envelope
When the seeds are white and have a papery texture, that means they are totally dry. Transfer them into an envelope and label the envelope with the date and type of pumpkin the seeds are from. Store the seeds in a cool, dry spot until it’s time for planting.
Avoid storing the pumpkin seeds in an area that exceeds 60 degrees Fahrenheit because that is the temperature at which pumpkin seeds start germinating. If necessary, put the seeds in the refrigerator in an airtight container. They can last for one year when properly stored.
Plant the seeds
Typically, pumpkins are planted in May through June so they can be ready by early October. Start your pumpkin seeds inside. Once a seedling has developed, transfer them to an outdoor garden after the last frost.
