Don,
You have plenty of time to dig some more sang! Heck, the sang in the pics is mostly green with only a few showing a slight hint of yellow. Around here, it usually takes 4 good Frosts to really kill off Ginseng and depending upon the canopy and understory, many plants will last quite awhile beyond the 4th good Frost. As more Frosts hit, look more to ridges along lakes and rivers as the fog that develops due to colder air settling in over the warmer waters, tends to protect Ginseng and other plants from the killing effects of Frosts.
Frank