humblehillsfarm
Crazy chicken lady
Not to scare you, but squash and cucumbers should really only be started 2-3 weeks before your last frost because they grow very quickly and are sensitive to root disturbance, so you really only want to transplant one time. They, along with the sunflowers, also do best in 4" biodegradable pots. Tomatoes on the other hand can and should be started 6 weeks before your last frost. Peppers should be started 10 weeks before your last frost. I would also set up a fan in your room on low and aim it at the plants. I always start the tomatoes and peppers in small cells like you have, and transplant them to solo cups after 3-4 weeks because they will quickly run out of room in cells. Sunflower stems should be a bit hardier than what I'm seeing. A fan simulates wind which helps the plants grow sturdier stems. Next year you should really look up your area's frost date and make a calendar for when to start your seedlings. It saves you so much time and stress.