July or August works best for many southern gardeners if we can find someone to water the garden for two weeks. It takes 4 to 5 days to drive to Montana from Georgia, so build an an additional 8 to 10 days on the road for the round trip. Late summer is "layin' by time", traditionally a time to pick veggies and water but no major planting or plowing. .We garden winter and summer here, but fall seed sowing does not start until late August or early September. We have Master Gardener classes here, but they do tend to push agri-chemicals as a remedy. But a short course with organic alternatives might make a good patch on an otherwise comprehensive Master Gardener certification. Unlike Montana, we grow tropical ornamentals and vegetables in our long hot summer and we need to learn universal principles. Our abundant bugs, red clay souls, high humidity and high heat fungal diseases, create unique challenges for anyone who would attempt to grow here.