Look at harvest maturity dates....and go for it. I just planted two more yesterday.

If you don't have frost you can grow tomatoes all year round. Same with peppers, they just grow slower in cold weather. And there are specific varieties that are known to grow in cooler weather...such as Oregon Spring, Stupice,Siletz, and possibly Legend. And there are plenty of other varieties, like Russian tomatoes, you could try.

We still have at least 4 months of warm weather...you should be able to grow any tomatoes right now...I'm more worried about having tomato varieties that produce in hot weather. The ones I mentioned above are for experimenting with in December.