Best Time to Drive: Lewistown, MT to Evergreen, MT

The best time to drive from Lewistown, MT to Evergreen, MT is August, July, when temperatures are comfortable and weather conditions are most predictable. January is the most challenging month due to weather risks along this route.

Best month

August

Also great

July

Also great

September

Month-by-Month Driving Conditions

Jan

Challenging 25°F

Feb

Fair 29°F

Mar

Fair 37°F

Apr

Good 44°F

May

Great 53°F

Jun

Excellent 60°F

Jul

Excellent 68°F

Aug

Excellent 67°F

Sep

Excellent 58°F

Oct

Good 44°F

Nov

Challenging 32°F

Dec

Difficult 24°F

Best Good/Fair Challenging

Average Conditions by Month

January

Avg temp 25°F

Rainy days ~1

Rating Challenging

February

Avg temp 29°F

Rainy days ~0.9

Rating Fair

March

Avg temp 37°F

Rainy days ~0.9

Rating Fair

April

Avg temp 44°F

Rainy days ~1.4

Rating Good

May

Avg temp 53°F

Rainy days ~1.8

Rating Great

June

Avg temp 60°F

Rainy days ~2.1

Rating Excellent

July

Avg temp 68°F

Rainy days ~0.9

Rating Excellent

August

Avg temp 67°F

Rainy days ~0.8

Rating Excellent

September

Avg temp 58°F

Rainy days ~1

Rating Excellent

October

Avg temp 44°F

Rainy days ~1.2

Rating Good

November

Avg temp 32°F

Rainy days ~1.2

Rating Challenging

December

Avg temp 24°F

Rainy days ~1.1

Rating Difficult

Seasonal Hazards on This Route

Mountain pass closures

Nov - Apr

Some mountain passes close seasonally (typically November through May). Check pass conditions before winter travel.

Climate Context

Lewistown, MT

Mountain West

Evergreen, MT

Mountain West

Ready to plan? See the full trip plan from Lewistown, MT to Evergreen, MT with stops, fuel costs, and directions.

Considering flying instead? Compare driving vs flying for this route.