Sorry, I have not been working hogs seriously long enough and they are very fossorial. Normally here, the adults stop surfacing in Mid oct. for the most part, neonates may stay active all winter if the lizard population is strong. The adults rarely surface again until they around the time they lay eggs.
Also I believe the reason they avoid the surface is more about moisture then temps. As the soils they use are draining soils, the surface drys out very very quickly. Even other colubrids avoid surface activity for long periods of time normally. So time will tell if the laying times change. I can say with a high degree of accuracy that other species, diamonbacks and gilas, are almost two months ahead of normal. I observed and filmed and photographed copulation in late Jan. throughout march, and it normally start in middle march. Simply put, we did not have a winter. Many of my outdoor cages were open all but a few nights this winter. Some winters they are closed and heated for three months strait. http://youtu.be/Nmt65r1R8C0
