You're welcome.
In your zone you will never need to start cucurbits (cucumbers, melons, gourds, squashes) indoors. Even in Zone 4 and 5 most people can just sow them directly into the ground and get the same result.
What many of us forget is that if we start plants early, we don't always get a "head start" because the transplant shock and adjusting-to-the-weather that seedlings undergo sets them back. In many years, if you started them indoors April 1st and planted some outdoors April 30th, they would still fruit at the same time. The direct-sown ones could even fruit sooner because they were never transplanted.
Heating mats can sometimes be found for $10 or $15, especially online. I often wait until the end of summer or early fall when gardening supplies go on sale at places like Walmart or Lowes, and get them on clearance for use the next year. lol
