The following tables summarize year and date clues in the Supervolcano trilogy. Since no year is ever given, the convention of using "Y" as the year of the Yellowstone Supervolcano eruption is adopted.
Supervolcano : Eruption
Page
Year
Month/Date
Summary of story clue
1
Y-2
End May
Stated its Memorial Day.
40
Y-1
Feb.
Stated
59
Y-1
July/Aug.
Park crowds in July & August
102
Y-1
Mid-Nov.
Stated
114
Y
May
Stated
137
Y
Aug./Sept.
Late Summer
156
Y
Sept. (est.)
Eruption
206
Y
Sept./Oct.
Fall replaced summer.
242
Y
Oct./Nov.
Fall pre-Thanksgiving.
311
Y
Nov./Dec.
Pre-winter.
343
Y
Dec.
Colin and Kelly dating 2 1/2 years.
349
Y
Dec.
Louise's period few days late.
388
Y+1
Feb.
Louise nearing end of first trimester.
Supervolcano : All Fall Down
Page
Year
Month/Date
Summary of story clue
2
Y+1
June
Stated.
20
Y+1
July 4
Stated.
37
Y+1
August
Louise due within two weeks.
46
Y+1
Aug./Sept.
Stated late summer.
59
Y+1
Aug./Sept.
Louise in labor.
68
Y+1
Nov./Dec.
Louise off maternity leave.
76
Y+1
Nov./Dec.
Bad harvests in US.
89
Y+1
December
Stated.
97
Y+2
Winter
Stated.
106
Y+2
Spring
Stated.
117
Y+2
June
Stated.
124
Y+2
Aug./Sept.
Eruption going on two years.
137
Y+2
mid-August
Stated.
162
Y+2
August
Fall semester starting soon.
173
Y+2
Autumn
Stated.
189
Y+2/3
Winter
Stated.
197
Y+3
Feb. (est)
Bryce six months at high school.
204
Y+3
Winter
Stated.
219
Y+3
Spring
Stated.
225
Y+3
Spring
Same scene, Kelly pregnant.
228
Y+3
Summer
Kelly due in few months.
233
Y+3
Spring/Summer
Bryce offered position coming Fall.
248
Y+3
Summer
Weather Seattle summer.
260
Y+3
Spring/Summer
Vanessa heading home to California .
261
Y+3
March/April
Past first day of Spring, before Tax Day.
279
Y+3
Spring
Stated. Vanessa on the road.
289
Y+3
Spring
Vanessa home in San Atanasio .
292
Y+3
August
Kelly pregnant but not "out to there".
297
Y+3
October
Barely autumn.
315
Y+3
Winter
Stated.
334
Y+3/4
Dec./Jan.
Kelly in labor.
365
Y+4
Winter
Stated.
369
Y+4
Winter
Rob's wedding announcement postmarked three weeks earlier.
Supervolcano : Things Fall Apart