Here in Alabama we have two types of blackberries...the first kind we call Dewberries and they get ripe first. Actually they are about to quit bearing soon. They grow close to the ground and are often plumper and juicier than the regular blackberries. They are often about knee high or shorter.
The regular blackberries aren't ripe yet but will be pretty soon and those can bear until over into late June.
We don't have bears here but wild hogs and coyotes are possibilities as well as snakes and ticks. LOL
So, be sure to watch where you step, dress in long sleeves to keep from being scratched by the thorns, and pick earlier in the day to avoid the heat.
Those tall, headhigh plants are the regular blackberry and they are great to eat as soon as they are black and somewhat soft. Enjoy!!