Since the big San Diego fire is now the largest in acreage in California recent history, at 270,000 acres, wondered how it compared.

Top ten by acreage:
Name/Cause/Date/County/Acres/Structures/Deaths
1 MATILIJA (UNDETERMINED) September 1932 VENTURA 220,000 0 0
2 MARBLE CONE (LIGHTNING) July 1977 MONTEREY 177,866 0 0
3 LAGUNA (POWERLINES) September 1970 SAN DIEGO 175,425 382 5
4 MCNALLY (HUMAN) July 2002 TULARE 150,696 17 0
5 STANISLAUS COMPLEX (LIGHTNING) August 1987 TUOLUMNE 145,980 28 1
6 BIG BAR COMPLEX (LIGHTNING) August 1999 TRINITY 140,948 0 0
7 CAMPBELL COMPLEX (POWERLINES) August 1990 TEHAMA 125,892 27 0
8 WHEELER (ARSON) July 1985 VENTURA 118,000 26 0
9 HWY. 58 (VEHICLE) August 1996 SAN LUIS OBISPO 106,668 13 0
10 CLAMPITT (POWERLINES) September 1970 LOS ANGELES 105,212 86 4

Interesting trend: Pretty well spread out, but 9/10 have been since 1970. Probably part of the issue of fire suppression got better in the 40s/50s/60s only to let the fuels build up.

Top ten by structures:
1 TUNNEL (REKINDLE) October 1991 ALAMEDA 1,600 2,900 25
2 JONES (UNDETERMINED) October 1999 SHASTA 26,200 954 1
3 PAINT (ARSON) June 1990 SANTA BARBARA 4,900 641 1
4 FOUNTAIN (ARSON) August 1992 SHASTA 63,960 636 0
5 CITY OF BERKELEY (POWERLINES) September 1923 ALAMEDA 130 584 0
6 BEL AIR (UNDETERMINED) November 1961 LOS ANGELES 6,090 484 0
7 LAGUNA FIRE (ARSON) October 1993 ORANGE 14,437 441 0
8 LAGUNA (POWERLINES) September 1970 SAN DIEGO 175,425 382 5
9 PANORAMA (ARSON) November 1980 SAN BERNARDINO 23,600 325 4
10 TOPANGA (ARSON) November 1993 LOS ANGELES 18,000 323 3

Interesting trend: You can see the wildland/urban interface kick in -- 6/10 where in the 1990s! Contrast that to largest acres when 3 where in the 90s, 2 in the 80s, and 3 in the 70s -- much more evenly spread out.