Less than 7 months or between 190 and 210 days
Additionally, it has been shown that as many as 25 percent of twin fawns have been sired by different fathers. The gestation period for white-tailed deer is slightly less than seven months, generally between 190 and 210 days. Fawning normally extends from May through July, with the peak in late May through June. In Missouri, most adult does produce twin fawns each year (Figure 7).  Randy published a gestation chart for whitetails 190 days, 196 days, 200 days, and 205 days for those who got the Spring '09 Deer Tracking Magazine. Here is a whitetail deer breeding chart based on the records of Kingdom Acres Deer Farm in Chambersburg, PA. Since mating season occurs in the fall, springtime is when whitetail doe tend to have their young. The average gestation period of the whitetail deer doe in North America is 200 to 205 days. This period can be shorter or longer depending on the availability of food. So, for the female whitetail deer, the spring is a very busy season, filled with late pregnancy, giving birth, and then starting to raise her new fawns. During this time you may see does and their fawns out together, and is more rare to see groups of doe together, since they are busy caring for A femalewhite tailed deer has a gestation period of 200 days. Other breeds of deer have pregnancies as short as 160 days. So about 5.3 months to 6.7 months. Hope it helps! Gestation for a whitetailed deer is about 6 and 1/2 months or 200 days. Does can mate in their first year but usually not untill the second year. Does usually give birth to on … ly one fawn the first time. The second time around the doe can have twins-triplets and in rare occasions quintuplets. The pregnancy, or gestation, period takes 6 1/2 to 7 months. Fawns are born from mid-March through June. Twins are the norm for older does, while young does usually give birth to a single fawn. Deer less than a year old, called fawns, are characterized by white spots over a reddish-brown coat.  If a doe is not mated, a second estrus occurs approximately 28 days later. Mating occurs from October to December and gestation is approximately 6 and a half months (200 days) . In her first year of breeding, a female generally has one fawn, but 2 per litter (occasionally 3 or 4) are born in subsequent years. Fawns are able to walk at birth and nibble on vegetation only a few days later. Gestation Period for Deer. The Gestation Period for a Doe is approximately 200-205 days from the first breeding until the fawn is born. Deer will generally conceive after one breeding. The Deer Gestation Period Calculator above attempts to generalize the estimation of the due date without any additional factors using a 201 day gestation period for Deer. *Uses an average 201 day gestation period for a Deer. Deer gestation periods can generally be anywhere from 200-205 days. Deer will generally conceive after one breeding. The Deer Gestation Period Calculator above attempts to generalize the estimation of the due date without any additional factors using a 201 day gestation period for Deer. Breeding occurs during the fall and winter, but may extend from late August through January. Peak breeding usually occurs in November. The gestation period for white-tailed deer is slightly less than 7 months or between 190 and 210 days. Fawning normally extends from March through July with peak fawn-drop occurring in late May. Does bearing young for the first time often have a single fawn. 
http://extension.missouri.edu/p/G9479 http://deerforums.org/index.php?/topic/396-whitetail-gestation-chart/ http://www.the-whitetail-deer.com/Whitetail-Deer-Doe-1.html http://www.answers.com/Q/What_is_the_gestation_period_of_a_deer http://www.agfc.com/species/Pages/SpeciesWildlifeDetails2.aspx?Title=White-tailed%20Deer http://edersbow.com/what-is-the-gestation-period-for-whitetail-deer/ http://www.gestationcalculator.com/other/deer-pregnancy-calculator http://www.gestationcalculator.com/other/deer-pregnancy-calculator http://www.clemson.edu/extension/natural_resources/wildlife/publications/fs34_whitetailed_deer.html
gestation period of whitetail deer