Elm If you are reading this in Grand Junction, Montrose, or Delta, then you are likely near many elm trees...
The Cupressaceae family of trees includes Juniper, Cedar, Redwood and Cypress. Juniper and cedar are common allergens in Western and Southwestern United States...
Cottonwood Cottonwood is one of the top three pollinating trees in Grand Junction, Montrose, and Delta. It is a common cause of severe Spring allergy symptoms...
Bermuda Bermuda grass is is prevalent in Grand Junction and Delta, but becomes less common at elevations equivalent to Montrose or higher. It is commonly used on lawns and golf courses and usually mowed before it grows tall enough to release its pollen.
Orchard Grass In lower elevation regions of Western Colorado (<8,000 ft), orchard grass is the predominant wild grass growing and releasing pollen.
Timothy Grass Timothy grass is the predominant allergen seen in Mesa, Telluride, Aspen, Crested Butte and with people who ranch up on the Mesa, probably starting to grow around 7,000 feet. It is also commonly used for hay in lower elevation areas.
Kochia Kochia is in the chenopod family of weeds, along with Russian Thistle, Lamb's Quarter and other weeds common to the Grand Valley. It grows throughout the Grand Valley beginning in June and starts to release pollen in August, peaking in late August and September. All of the pollens in chenopod family are nearly identical under the microscope and to the immune system. So, if you are allergic to kochia, then you are also allergic to Russian Thistle, Lamb's Quarter, etc. This can result in severe symptoms during late summer and early autumn.
Ragweed Ragweed is one of the most well known weed pollen in the United States. However, the Grand Valley has a surprisingly small amount of ragweed growing here. We have more false ragweed than true ragweed. What ragweed we do have pollenates July through September.
Sagebrush Sagebrush is native to Western Colorado and grows in large numbers on the National Monument, Uncompahgre Plateau and the sides of the Grand Mesa. It is the heartiest of the major pollen-releasing weeds in the region, releasing its pollen from August until there is a hard frost (or two), often releasing pollen well into November.