I believe the last time I tried it was in the fall. but in years past I have tried in the spring also.
It sounds strange but our climates are very different. I lived most of my adult life just 2 hours west of here and although it was hotter inland (we do get the coastal breezes here) I was able to grow far more, including garlic, than I can grow here. It is just a different kind of heat and humidity and we stay hot all night during the warm months. The plants never get a break. The marshy island I live on does have some areas that are pure sand. At one time it was a prime tomato growing spot but I do not have any of that well draining sand here on our low lying property.