748 Journal of Agricultural Research voi.xxx, No. 8 
Table XIII .—Average number of general risk fires per year , per million acres, by 
10-day periods —Continued 
REGION 6—SOUTHERN OREGON AND NORTHERN CALIFORNIA COAST RANGES 
Number of fires, by forest types* 
v Period 
/■>: ' 
Western 
yellow 
pine 
Western 
yellow 
and 
sugar 
pines 
Douglas 
fir 
. 
Fir and 
lodge- 
pole 
Sub- 
alpine 
Digger 
pine 
and 
oak 
Brush 
Grass 
Mar. 11-20______ 
0.2 
i 
21-31_ 
! 
r 
Apr. 1-10_ 
.3 
11-20.. 
.3 
0.2 
21-30__ __ 
.5 
1 
May 1-10_____ 
.5 
6.3 
.2 
ll-20.___-.___. 
1.8 
1.2 
.8 
0.7 
.4 
21-31... 
1.0 
1.9 
.3 
2.7 
0.9 " 
.6 
- 
June 1-10_ 
2.8 
2.6 
1.1 
.7 
.9 
1.1 
4.4 
11-20_ 
1.0 
1.6 
1.3 
.4 
21-30.__ 
1.0 
.3 
.7 
.6 
July 1-10. 
5.3 
7.7 
3.1 
N ■ 8.0 
.9 
4.4 
13.2 
11-20.... 
3.9 
6.1 
6.2 
4.0 
3.9 
2.8 
3.2 
13.2 
21-31_ _ _ __ 
7.4 
9.5 
7.8 
7.4 
3.9 
.9 
5.6 
4.4 
Aug. 1-10.. 
6.8 
4.7 
4.8 
3.3 
11.4 
8.9. 
8.8 
11-20_ 
4.2 
9.1- 
8.1 
10.7 
3.9 
.9 
11.6 
13.2 
21-31._ 
7.7 
10.2 
20.7 
22.8 
11.7 
9.5 
13.8 
13.2 
Sept. 1-10__ 
1.8 
4.6 
5.9 
1.3 
2.8 
4.4 
4.4 
11-20..________ 
1.8 
2.1 
2.2 
2.0 
1.9 
8.4 
21-30..... _____ 
1.8 
3.3 
3.9 
1.3 
4.7 
4.7 
Get.- 1-10 __ 
.4 
3.3 
2.8 
4.0 
6.8 
11-20._____ 
1.4 
2.3 
7.0 
2.0 
s 
7.0 
4.4 
21-31...._ 
1.0 
1.4 
.6 
.9 
V 7 
30.8 
Nov 1-10.. 
.4 
.2 
.6 
11-20._ __ 
.4 
.7 
21-30_ 
1.4 
.2 
.8 
Danger periods A *>__■_ 
May 11- 
May 11- 
June 1- 
May 21- 
July 11- 
July 11- 
June I- 
June 1-' 
June 20; 
Oct. 31 
10; July 
31; June 
31; Aug. 
Sept 30 
10; July 
10; July 
July 1- 
l-Oct.20 
11-20; 
. 11-31 
1-Oct. 
1-Sept. 
Sept 33; 
July l- 
31 
10; Oct. 
Oct. 11- 
Oct. 20 
11-31 
31; Nov. 
21-30 
.’V 
Danger periods B 6 ___ 
Julyl- 
July 1- 
July 1- 
July 1- 
Same as 
Aug. 1- 
Julyl- 
Same as 
Aug. 31 
Sept. 10; 
Sept. 10; 
Aug. 31; 
A 
10; Aug. 
Oct. 20 
A 
Sept. 21- 
Sept. 21- 
Oct. 1- 
21-31; 
. ■ 
Oct. 10 
30; Oct. 
10 
Sept 21- 
11-20 
30 
c 
REGION 8—EASTERN OREGON AND SOUTHWESTERN IDAHO 
Number of fires, by forest types 
Period 
■ / 
Western 
yellow 
pine 
Douglas 
fir and 
larch 
Lodge- 
pole pine 
Spruce, 
white fir 
(cedar) 
Subalpine 
Brush 
Grass 
and sage 
Apr. 21-30..._______ 
0.1 
1 
! 
May 1-10. .. 
.1 
* i 
i 
11-20.. 
t i 
i 
21-31.__ 
.3 
! . 1 
: i 
r 
June 1-10.. 
f 1 
* j 
i 
11-20__ 
.5 
| * | 
1 4 : 
i 
21-30_ 
.5. 
0.1 
! 
0.3 
July 1-10._ 
.5 
0.1 
.2 
0.3 
.7 
11-20...___. 
1.2 
.2 
.6 
1.0 
1.3 
21-31________ 
3.6 
1.5 
1.9 
0.5 
.6 
.7 
Aug. 1-10_ 
7.4 
3.1 
1.9 
2.5 
1.1 
1.0 
1.7 
11-20__ 
7.7 
2.4 
2.4 
.5 
2.2 
2.0 
1.7 
21-31. ___ 
6.9 
2.9 
1.9 
1.9 
\ 1.0 
3.0 
Sept. 1-10.____.. 
4.0 
1.8 
2.0 
.8 
2.3 
11-20... 
.9 
.9 
.2 
.5 
.6 
. 7 
21-30__ 
. 5 
.3 
.1 
.5 
---, 
Oct, 1-10. ______ 
.3 
.3 
i 
ll-20_____.______ 
.1 
i 
21-31... 
.1 
.1 
.1 
Nov. 1-10.. 
.1 
Danger periods A b __ 
July 11- 
July 21- 
July 21- 
Aug. 1-10 
Aug. 1-31 
July 11- 
July 11- 
Sept. 10 
Sept. 10 
Sept. 10 
Aug. 31 
Sept. 10 
Danger periods B h . _ _ 
July 21- 
Aug. 1-10 
None. 
None. 
None. 
None. 
Aug. 21- 
Sept 10 
■ 
31 
^Danger periods A are the periods during which one or more than one fire occurs in 10 days. Danger 
periods B are the periods within which three or more fires occur in 10 days, or two fires or more a week. 
