Hamm Fire

Wildfire in Mariposa and Tuolumne counties, August 1987

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Printed October 28, 2026 from www.firezones.info/fire/4170/hamm-fire-1987

Key facts

Started August 30, 1987
Contained September 13, 1987, after 14 days
Burned 33,144 acres
7th largest fire of 1987
Cause Lightning
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Where it burned

Counties

  1. Mariposa County 16,940 acres
  2. Tuolumne County 16,212 acres

Communities

  1. Greeley Hill 1,459 acres
  2. Pine Mountain Lake 1,309 acres
  3. Buck Meadows 343 acres

Acres are the land the fire burned in each county and community, and places where it burned less than an acre are not listed. Communities are cities, towns and the unincorporated places the Census Bureau names, so land outside any of them is counted only in its county.

The same land, other fires

Burned before

  1. 1909 Unnamed fire 9,730 acres in total 2,566 acres shared
  2. 1910 Unnamed fire 9,001 acres in total 6,751 acres shared
  3. 1910 Unnamed fire 4,019 acres in total 277 acres shared
  4. 1911 Unnamed fire 1,271 acres in total 432 acres shared
  5. 1911 Unnamed fire 277 acres in total 262 acres shared
  6. 1912 Unnamed fire 716 acres in total 645 acres shared
  7. 1920 Unnamed fire 13,346 acres in total 5,459 acres shared
  8. 1924 Unnamed fire 3,954 acres in total 2,555 acres shared
  9. 1926 Unnamed fire 577 acres shared
  10. 1927 Unnamed fire 15,823 acres in total 5,440 acres shared
  11. 1930 Unnamed fire 1,438 acres shared
  12. 1932 Unnamed fire 522 acres shared
  13. 1933 Unnamed fire 345 acres in total 335 acres shared
  14. 1947 Unnamed fire 2,050 acres in total 765 acres shared
  15. 1948 Unnamed fire 738 acres shared
  16. 1949 Unnamed fire 6,211 acres shared
  17. 1950 Hayward Fire 988 acres in total 570 acres shared
  18. 1959 Smith Fire 1,300 acres in total · Cause: Miscellaneous 1,165 acres shared

Burned again

  1. 2004 Tuolumne Fire 721 acres in total · Cause: Miscellaneous 560 acres shared
  2. 2013 Rim Fire 256,176 acres in total · Cause: Campfire 17,043 acres shared

And 27 more fires that burned less of the same land. Acres are the land each fire shares with the Hamm Fire, and fires that shared less than an acre are not counted. Some older or smaller fires may be missing, and a fire perimeter can include unburned patches. How to read fire history

Sources

Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Building damage
CAL FIRE Damage Inspection
Updated 19 October 2026

This site is independent and not affiliated with CAL FIRE or the CPUC, so for an official determination, check with the agency or your city or county. How we read the data