They'll be fine. The thing that gets them this time of year (as well as springtime) is freezing rain. If they don't encounter freezing rain, they'll hardly be affected at all right now.
The weather forecast below looks to be detrimental.....let's pray it doesn't pan out.
Posted via Fair Use from the National Weather Service Sioux Falls Office(bold emphasis mine):
Hazardous Weather Outlook
National Weather Service Sioux Falls SD
446 AM CDT Thu Oct 10 2019
MNZ071-072-080-097-098-SDZ040-056-059>069-111000-
Lincoln-Lyon-Murray-Pipestone-Rock-Brookings-Moody-Davison-Hanson-
McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-
Yankton-
446 AM CDT Thu Oct 10 2019
This Hazardous Weather Outlook is for southwest Minnesota, east
central South Dakota, south central South Dakota and southeast
South Dakota.
.DAY ONE...Today and tonight.
Periods of rain or drizzle, along with a few rumbles of thunder, are
expected today.
This will transition to snow or freezing drizzle as
colder air spreads east across the region late today and tonight.
Minor snow accumulations and a light glaze of icing are possible.
Temperatures are expected to fall below freezing tonight, with wind
chills in the teens to lower 20s by daybreak Friday. You will want to
protect sensitive outdoor vegetation and take other precautions
against the sub-freezing temperatures.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Areas of light snow will remain possible into Friday, though any
additional accumulation is expected to be less than a half inch.
Scattered snow or rain showers will be possible again on Saturday,
with little if any snow accumulation. In addition to the snow,
westerly winds will be gusting to 30 to 45 mph Friday and Saturday.
If you have any travel plans through Saturday, especially to the
north and west, you will want to continue monitoring the forecast and
latest road conditions before heading out.
Colder temperatures in the mid to upper 20s are likely Friday night,
effectively ending the growing season. Wind chills will remain in the
teens to lower 20s into Saturday morning.