Grasshopper and Mormon Cricket Outbreak Forecasts and Survey Information

National Adult and Nymphal Survey Maps (U.S.)
Grasshopper Forecast (Hazard) Maps (U.S.)
Grasshopper Forecast Maps - Canada
State Survey Maps and Reports (U.S.)
Text Reports

Western U.S. Adult and Nymphal Grasshopper and Mormon Cricket Survey Maps

Field surveys of grasshopper densities and mapping were done by USDA-APHIS-PPQ Western Region.

1. 2007 Adult Grasshopper Survey Map (July 2007)
2. 2007 Adult Mormon Cricket Survey Map (July 2007)
3. 2006 Adult Grasshopper Survey Map (October 2006)
4. 2006 Adult Mormon Cricket Survey Map (October 2006)
5. 2005 National Adult Grasshopper Survey Map (August 26, 2005)
6. 2005 National Mormon Cricket Survey Map (August 26, 2005)
7. 2005 Nymphal Grasshopper Survey Map (June 24, 2005)
8. 2004 Adult Grasshopper Survey Map (Oct 20, 2004)
9. 2004 Nymphal Grasshopper Survey Map (Oct 1, 2004)
10. 2004 Mormon Cricket Survey Map (Oct 1, 2004)
11. 2003 Grasshopper Adult Survey Map (Oct 14, 2003)
12. 2003 Grasshopper Nymphal Survey Map (Aug 8, 2003)
13. 2003 National Mormon Cricket Survey Map (Oct 14, 2003)
14. 2002 Adult Grasshopper Survey Map (Oct 25, 2002)
15. 2002 Nymphal Grasshopper Survey Map (Oct 8, 2002)
16. 2002 Mormon Cricket Density  (Oct 8, 2002)

* Please note: Dates on the maps indicate when the map, NOT the survey sampling, was completed. For example, the Grasshopper Nymph Map is an early-season survey, whereas the Adult Map is a late-season survey.

U.S. Grasshopper Forecast Maps (Hazard Maps)

A collection of regional grasshopper forecast or hazard maps for the western United States compiled by USDA-APHIS starting in 1994.  The maps summarize the previous year's grasshopper densities to show the anticipated risk, or hazard, of grasshopper problems throughout the western U.S for the year specified. The number of eggs laid by grasshoppers during the summer and weather conditions in the winter and spring can have large impacts on grasshopper densities, but are not reflected in the forecast maps.

Hazard maps: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007

Canadian Grasshopper Forecast Maps

1. 2007 Grasshopper Forecast Map for Alberta, Canada
2. 2007 Grasshopper Forecast Map for Saskatchewan, Canada
3. 2007 Grasshopper Forecast Map for Manitoba, Canada
4. 2006 Grasshopper Forecast Map for Alberta, Canada
5. 2006 Grasshopper Forecast Map for Saskatchewan, Canada
6. 2006 Grasshopper Forecast Map for Manitoba, Canada
7. 2005 Grasshopper Forecast Map for Alberta, Canada

8. 2005 Grasshopper Forecast map for Saskatchewan, Canada

9. 2005 Grasshopper Forecast Map for Manitoba, Canada

10. 2004 Grasshopper Forecast Map for Alberta, Canada

11. 2004 Grasshopper Forecast Map for Saskatchewan, Canada

12. 2004 Grasshopper Forecast Map for Manitoba, Canada

13. 2003 Grasshopper Forecast Map for Alberta, Canada (Jan 8, 2003)

Provided courtesy of Dr. Dan Johnson, Agriculture and Agri-Food Canada, Lethbridge, Alberta.

14. Grasshopper forecast for June, 2003 for Alberta, Saskatchewan and Manitoba (June 2003)

Provided courtesy of Dr. Dan Johnson, Agriculture and Agri-Food Canada, Lethbridge, Alberta.

State Survey Maps and Reports

1. North Dakota cropland and rangeland grasshopper field surveys
2. Nebraska grasshopper survey maps and reports
3. Idaho rangeland grasshopper and Mormon cricket suppression program and survey results
4. 2002 Montana Adult Grasshopper Survey Map (Oct 25, 2002)

Text Reports

1. 2002 Western Region Statistics Report - Grasshoppers and Mormon Crickets  (PDF - 81K)

Provided courtesy of William C. Kauffman, Regional Program Manager, USDA-APHIS-PPQ Western Regional Office, Fort Collins, Colorado.

2. 2003 Grasshopper Forecast for Alberta and Adjoining Regions of Saskatchewan

Provided courtesy of Dr. Dan Johnson, Agriculture and Agri-Food Canada, Lethbridge, Alberta.