Branson Bob-you say 12" spikes? I built our home in 1979-80 using 3/8 x 12" spikes (they are a common nail style) which was common practice for stack log homes back then. I pre-drilled mine with a 5/16 bit, beat them in with a 6#, short handled sledge.
Since then I've used pole barn spikes a few times in my post-frame farm buildings. They are strong but can be cantankerous too. They are also very hard and eyes can be damaged easily, plus they are pricey and ask to be beat on in awkward positions.
In my current off-grid cabin build I'll use the now commonly found timber screws. They are stronger and with better holding power while also easier to drive via hex heads or Torx/star drive using cordless tools or high torque corded drivers. Zero pre-drilling, don't break, seriously strong and fast to drive.
Prices vary a lot. Avoid low quality Asian ones on the market.
Know that box store prices are too high unless you only need a handful. My source is Corr-Tenn in Knoxville, TN. Ask for the log & timber frame sales guy.
12" spikes and large nails are long gone from building trades for log home and timber frame builders. Torx drive timber screws rule the day. Spax is a VG brand but can be pricey not bought where it's best pricing.
Spring?

it came a month ago here then left the state of KY, snowing today, soon it'll be really hot.