Many departments are now advertising their geology field school information on their geology WWW home pages. One example is a two credit hydrogeology field camp at University of Minnesota. If you need further advice, ask your undergraduate geology and geophysics advisors. So, it is best to begin writing away for application forms and information at the end of the first semester or beginning of second semester. Most field schools do not include the cost of getting to field camp.
Many field schools do include the cost of lodging and food in their tuition.
Other expenses such as laundry, field supplies, and other incidentals are usually not included. Be sure to ascertain all of this information before committing to a field school. Some schools require a deposit when you apply. There are few sources of financial aid for summer field school. Unfortunately, Rice University Financial Aid packages do not generally give support for summer school.