Thanks. Success depends on where you live. Different areas call for different schedules. Here in NC I usually find corns after 7:30pm this time of year and only after hot days (the time gets later as it gets closer to summer). Corns also crawl around 9-10am in the mornings on warm days - After 10am , forget it!
In South Florida you should be able to find corns this time of year after 9pm all the way until around 1am. That is when I found corns in S. Florida when I herped there a few times in the past. I herped areas South of Miami and had decent success for the most part.
Other things you should remember to be more successful/increase your luck:
1. Use highways that have the least amount of traffic on them. I know that is hard to do, but there are a few roads in S. florida where you can still go. Buy a very detailed map (that shows all the back roads) - that helps a LOT. Determine which roads link towns and which don't. Use the ones that do not link towns together or even have dead ends. This means less traffic = more corns survive over the years = more living corns for YOU to find.
2. Basic habitat info: Corns LOVE and prefer wooded areas, but will also go to open fields, though less frequently unless abandoned & derilict buildings/barns are present.
3. Microhabitat info for "flipping" (looking under objects): Select trash sites that are in wooded areas or thick bushy areas or areas bordering woods. Type of trash I found corns under: Large Boards, car hoods, tin sheets, carpets. Make sure that all these items have been dumped at least a year earlier. I never found corns under "fresh trash piles", I think this is because corns can still smell human scent there and avoid them. Go flipping only in the very early morning hours (usually from 5am-8am, sometimes up to 9am) before the sun can heat the objects up. After that snakes usually abandon those areas to seek shelter from the excessive heat.
4. Almost forgot: Corns ARE nocturnal and generally love to crawl between the hours of 9am until 10am in the mornings and then again from 9pm-11pm seems to be MOST of the activity. After 11pm you can still find them til' about 1 am, but less frequently.
I DID NOT READ THIS IN A BOOK, BUT HERPED A LOT OF AREAS in my past twenty years that have corns: Florida, Georgia, Alabama, South Carolina, North Carolina, Mississipi, Louisiana. I found corns in all of those states in the past.
Hope this helps. Let me know if you have any questions.
Good luck,
Zee