I kinda stay away from early varieties for fear of late frost in Spring… and in Germany we have this particular day called the `Eisheilige tag …. in direct translation Ice Saints day… I believe it usually occurs in mid May… and the flowers from strawb plants gets these black ´burnt´ spot in the middle of the flowers.
I grow perpetual strawberries. They are not daylight dependent like most, so even if you get a late frost you will still have them cropping periodically until autumn and you don’t have a massive glut one week and then none for months.
Crop will depend on weather and age of plants but to give an indication I have 10 plants that are in their 3rd year and probably produce 2 desert bowl per month on average late June to late september