What are you trying to start?

Germination temps vary by seed type.

Congrats on the new hoop house! Very fun : )

Keriann~

Hi Ginny - If you read through the FAQs here on how to grow from seed you'll find that soil temperature is what is vital to germination, not air temperatures. That is why the use of heat mats under your seedling trays is commonly recommended.

And soil temperatures in the 70-95 degree range (depends on the seed type) must be maintained until germination happens so the only way to do that is by using bottom heat sources like heat mats.

Once the seeds sprout, then it is time to worry about what the air temperatures are and yes, in your zone you may have to provide some heat on at least a few nights. Once the plants have sprouted we try very hard to keep the air temperatures between 45 for a low and 65-70 for a high.

Dave

Here is a link that might be useful: Growing from Seed FAQs

Thanks for the help. Im growing a little of everything to start my garden outside in may. I have about 7 trays. And no power outside unles we use a extenion cord. And again using 7 trays i think i would need to plug in would need to plug in 7 cords. Thx

Then why not just germinate them in the house where you can supply the heat and then move them to the hoop house once they are sprouted? That would be the easiest way to go since they are in trays.

Dave