From all these comments, I'm guessing that next year I need to plant
earlier, not fertilize, and perhaps arrange for some shade. The plot
is exposed to full or almost sun at least half the day. The garage
wall shields the plants from the sun the second half of the day. If
the soil is the problem, can't I send a sample to some state service
and get it analyzed. Let's say I learn there is "too much" nitrogen
in the soil; what then is the solution before I plant?

Meanwhile, I'll wait and see if they don't start setting fruit and
bearing tomatoes later in the season.