| January→ |
Empty
5% of peak · 42K visits
|
Harsh
31°F / 12°F (0°C / -11°C) · 11.5″ snow
|
Limited
Composite access score · 35/100
|
Interior closed to wheeled vehicles. Mammoth–Lamar–Cooke City corridor open. Snowcoach access only beyond.Read January → |
| February→ |
Empty
5% of peak · 45K visits
|
Harsh
34°F / 12°F (1°C / -11°C) · 11.5″ snow
|
Limited
Composite access score · 35/100
|
Coldest readings of the year. Lamar wildlife watching is the reason to be here.Read February → |
| March→ |
Empty
4% of peak · 33K visits
|
Harsh
42°F / 19°F (5°C / -7°C) · 10.9″ snow
|
Limited
Composite access score · 35/100
|
Plowing begins on interior roads. Snowcoach interior tours start winding down — confirm 2027 dates before booking.Read March → |
| April→ |
Empty
8% of peak · 73K visits
|
Rough
50°F / 26°F (10°C / -3°C) · 7.8″ snow
|
Mostly open
Composite access score · 60/100
|
Spring road openings begin (mid-month). Bears emerge. Trails muddy, geyser basins quiet.Read April → |
| May→ |
Moderate
55% of peak · 508K visits
|
Ideal
60°F / 35°F (15°C / 1°C) · 1.7″ snow
|
Full
Composite access score · 90/100
|
Most interior roads open by Memorial Day. Waterfalls run full. Crowds still light early.Read May → |
| June→ |
Packed
90% of peak · 831K visits
|
Ideal
70°F / 42°F (21°C / 6°C) · 1.86″ precip
|
Full
Composite access score · 100/100
|
Operations effectively full. Lodging tight. Cold mornings into the 30s remain normal.Read June → |
| July→ |
Packed
100% of peak · 923K visits
|
Ideal
81°F / 48°F (27°C / 9°C) · 1.27″ precip
|
Full
Composite access score · 100/100
|
Peak month. Plan trailheads for sunrise. Afternoon thunderstorms common.Read July → |
| August→ |
Packed
89% of peak · 820K visits
|
Ideal
80°F / 47°F (27°C / 8°C) · 1.05″ precip
|
Full
Composite access score · 100/100
|
Bison rut. Crowds still elevated. School-restart week is the first crowd drop.Read August → |
| September→ |
Packed
86% of peak · 796K visits
|
Ideal
69°F / 39°F (20°C / 4°C) · 0.6″ snow
|
Full
Composite access score · 100/100
|
Best tradeoff month. Wildlife active, weather workable, lodging easier after Labor Day.Read September → |
| October→ |
Quiet
33% of peak · 302K visits
|
Mixed
54°F / 29°F (12°C / -2°C) · 4.7″ snow
|
Full
Composite access score · 85/100
|
Bull elk in rut at Mammoth. First snows in the high country. Lodges start closing mid-month.Read October → |
| November→ |
Empty
3% of peak · 24K visits
|
Harsh
39°F / 19°F (4°C / -7°C) · 9.9″ snow
|
Limited
Composite access score · 30/100
|
Interior roads close to wheels (early month). Quietest period of the year.Read November → |
| December→ |
Empty
4% of peak · 34K visits
|
Harsh
30°F / 12°F (-1°C / -11°C) · 12.6″ snow
|
Partial
Composite access score · 40/100
|
Winter operations begin (mid-month). Snowcoach and snowmobile season opens to interior.Read December → |