It is not all that simple. Sure there may be some local code, or cemetery guides, but it all depends on soil type and other factors such as snow cover, water table, soil moisture content, etc. What is the reason you need this? If you are afraid of frost heave for foundations, there may be the code, whether right or wrong. If you have relatively clean sand, likely no frost heave even if the freezing line goes deep. Here again, remember water,when freezing, gives off heat. The more water the less the depth of freezing, as for a lake. Silty sands are likely to have more soil moisture content than clean sands and thus less depth of freeing. However, even then this shallow stuff can heave significantly in the process. It all depends on the amount passing the No. 200 sieve and a rough guide. With P-200 over 10 percent heave is likely, except for clays which don't let moisture migrate to the freezing zone rapidly enough to be a problem.. Without any other info, see if the US weather bureau has any maps of "frost depth" averages, etc.
