You can test for lead contamination in your soil, and can do it in January as long as the ground is not frozen, making getting samples out very difficult. (You take 8 about 4-6 inches down).
Here is our page on soil testing, including a video about how to take a good sample and a list of regional labs to mail the sample to for professional analysis:
The lab chart shows that the basic test from U Mass includes lead (Pb)
but you can check websites of the labs to confirm.