Snow Caches

• Site selection
• Construction and Storage (Pit Cache)
• Construction and Storage (Culvert Cache)
• Inspection

The Intermountain Region has used snow caches successfully for over 20 years. Two types of snow caches have been used, pit caches and culvert caches. The Northern Region has also used these systems for many years. In addition, the Northern Region has used the same principles to develop log house and cement house snow caches. Although these caches are not permanent structures, they have the advantage of double-entrance door construction that provides quick, safe, easy access to all seed lots. All these systems will meet storage requirements given proper location, design, and protection. All will easily maintain temperatures of 33 °F and humidities near 100 percent. Once seedlings are properly stored in the cache, they should not be moved or handled until 1 to 2 days before planting. (top)

Site Selection

Temporary snow cache sites should be selected in the fall. Consider the following factors for all snow caches:

• The area should be large enough for tree storage and for vehicles to turn around.
  
  
• Adequate snow must be available.
  
  
• The site should be nearly level, but well drained.
  
  
• Northerly aspects are usually best.
  
  
• Adjacent slopes must be stable (no landslides or snow movement).
  
  
• Tree trunks should not be within the cache; they conduct heat and will melt the snow.
  
  
• Midday shade patterns should be considered for the time of year the cache will be used. About 40 percent shade is desirable.