Is it too cold to plant lettuce when the temperatures have been in the low 30s at night?

Question: I live in the midcoast region. I would like to start planting lettuces, but the temps have been low…30’s at night and 40’s-50’s during the day. Is it still too early/cold or can I plant the seeds? What other cold weather vegetables can I plant now? I will be adding compost and 5-10-5 to read more Is it too cold to plant lettuce when the temperatures have been in the low 30s at night?