It seems like it depends on the buckeye species. Aesculus glabra requires cold stratification for 120 days, and Aesculus pavia requires cold stratification for 30 days

I don't know the specie I got, but I got some very fresh seeds and they sprouted in a matter of days. You may want to give some winter protection if you are going to sow them now.

Omar

All I was told is that one is a red buckeye and one is a smooth buckeye. One is still in the pod. They came from Brownwood, TX. if I were to them up and keep the pots outside under an eve or against a wall, do you think that would work?

If you plant them now , you will need to protect them through the winter.

They say to plant promptly , do not scarify. Plant in loose well drained aerated sandy loam and leaf mater. Provide enough root space. Best containers are 18" deep. Plant seeds an inch deep and 4" apart. Germination will occur from 3 days to a month. Overwatering during germination can cause rot. . The plant will be working on roots the first bit of time and not show much top growth till spring. A light frost won't damage the stem but protection with mulch or a cold frame is suggested for severe weather. Often buckeyes that are sown outdoors that have frozen back will re sprout from the roots. Fertilize heavily once the stems have broken growth . They should be ready for a 5 gallon pot by their second fall.

This is paraphrased from page 91 of Jill Stokes, "How To Grow Native Plants Of Texas And The Southwest"... Great book for propagators.

I have grown the Mexican buckeye easily. I had 75 % germination planting them in the ground out doors. but I lost some of them because I planted where I could not get water to them. I had 99% germination in pots and then transplanted them into the ground with in a month and a half. These were not true buckeyes.

Jill Stokes says that Buckeye seeds need to be planted immediately after collection because they have high content of fats and lipids and degenerate quickly after collection. They will loose viability rapidly if allowed to dry out. They will also rot if kept for more than a couple of days in a plastic bags or if they have been buried beneath leaves or laid on damp ground. If sowing must be delayed a few days following collection, storing the seeds in loose paper bags in a refrigerator will help preserve viability. Seeds kept in dry storage over winter seldom germinate well the next spring.