Need warm nights. Was a slow start.
You can always just put the tomatoes in a paper bag with a banana and the ethylene (I believe it's ethylene) given off by the banana will ripen them.
"Placing the tomatoes near another fruit that releases ethylene, such as a banana, can speed the process. Cut nearly ripe green tomatoes off of the vine, using the pruning shears. Place the tomatoes in a large paper bag or an empty shoebox."