Question
I recently planted acorns indoors from oak trees in Virginia.  The trees have grown about 6 inches and have large leaves.  I am wondering what kind of fertilizer I should use to help them grow.  Also, I live in Vermont, will these trees ever survive outdoors?  

Answer
You did not say what type of planting container they were in. If they are in small pots gently transplant them into larger pots (simular to the ones you see in nurseries).

Select pots that are at least 1 foot deep to allow enough space for the roots to develop. The bottoms of the containers should have drainage holes. Fill your containers with a mixture of half potting soil and half topsoil from your yard or garden. You can mix approximately 1 teaspoon of a slow-release fertilizer like Osmocote, Nutricote, or Nursery Special with the soil if you want. Plant several acorns three times the depth of the acorn. Water once a week, but do not over water because this can cause rot. About 1 week after the acorns germinate and seedlings emerge, remove inferior (smaller) seedlings, leaving only one dominant (largest)seedling in each individual pot. If you did not add a slow-release fertilizer to the planting mix, water with a liquid fertilizer, such as Peter抯 or Miracle-Gro, at one-half the rate every 6 weeks. The containers may be placed outside around April in a partially shaded location for 4 to 6 weeks to acclimate them to outdoor conditions. Then you can move them to a sunny location for maximum growth.You must water the pots if rainfall has not occurred for a few days.
Transplanting Seedlings Do not disturb the seedlings until after several frosts have occurred. The cold weather will harden off the seedlings so you can transplant them to their desired location. Treat the transplanted seedling like any other plant: dig an appropriately sized hole, add organic matter if necessary to promote drainage, water, and mulch. You may want to plant two to three seedlings in the desired location and later remove all but the most vigorous.In some areas, you might need to protect the seedlings from animal damage such as deer browsing.Fences or tree sleeves can help keep the seedlings from being destroyed. Seedling sleeves or shelters are available from forestry or garden suppliers.Different species of oaks grow at different rates. White oaks may be as tall as 10 to 15 feet in 10 to 12 years. A water oak may grow as tall as 25 feet in 10 years, while a southern red oak may take 25 years to get that tall. The growth of a tree depends on the soil type, nutrient and water availability, and the amount of light it receives.
You also might check with the Vermont State Forestry agency. They will more then likely have information on timing of planting for that area. Here is the web link to their contacts you can find the one closest to you.
http://www.vtfpr.org/htm/for_forstaff.cfm