Weed Prevention Areas: Protecting Montana from Invasive Weeds
Evaluation

It is not easy to assess prevention because it is difficult to measure invasion events that did not occur. Short-term evaluation measures therefore include assessing the strategy design that lead to the preferred outcomes. In addition, the number of new invasions detected and removed each year can provide a measure of the work accomplished.

Additional measures include stakeholder satisfaction, engagement of local citizens, and the number of partnerships formed among multiple-level stakeholders. Long-term measures of success are optimal and include comparing future inventories to baselines to determine if strategies were effective over time. Prevention would be considered effective if high-risk sites remained weed-free over time and ineffective if new weeds establish and persist.

Cattle on rangeland
The maintenance of weed free rangelands over the long term is the preferred outcome of weed prevention areas.

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