Kurt Vonnegut's book 'Mother Night' takes place around 1965. There's a line where a shut in almost swoons when strawberries come back in season. Today you can get fresh fruit any month.
Even when I was a kid fruit was seasonal. Strawberries, blueberries, watermelon, pineapple, kiwi, etc. were all seasonal.
I remember being excited when my favorites started showing up in stores through the year. Watermelon was the big one and seedless wasn't the normal, it was great.