Frost Dates for Mountain House, CA

Based on data from Tracy Pumping Plt weather station, 2 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. January 19
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. December 10
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost January 31
First Fall Frost December 4

Hard Freeze (28°F)

Last Spring Hard Freeze January 1
First Fall Hard Freeze December 22
37.78°N, -121.54°W © OpenStreetMap

Growing Season

326 Days January 19 to December 10

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 9b

Avg. annual minimum: 25 to 30°F (−4 to −1°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

Köppen climate map

Temperature

40° 60° 80° 100°
48°
High: 56°F
Avg: 48°F
Low: 41°F
Jan
53°
High: 62°F
Avg: 53°F
Low: 44°F
Feb
57°
High: 67°F
Avg: 57°F
Low: 47°F
Mar
62°
High: 73°F
Avg: 62°F
Low: 50°F
Apr
68°
High: 80°F
Avg: 68°F
Low: 55°F
May
74°
High: 88°F
Avg: 74°F
Low: 59°F
Jun
78°
High: 93°F
Avg: 78°F
Low: 62°F
Jul
77°
High: 93°F
Avg: 77°F
Low: 62°F
Aug
75°
High: 89°F
Avg: 75°F
Low: 60°F
Sep
67°
High: 79°F
Avg: 67°F
Low: 55°F
Oct
56°
High: 66°F
Avg: 56°F
Low: 46°F
Nov
49°
High: 57°F
Avg: 49°F
Low: 40°F
Dec
Avg High Avg Temp Avg Low

Precipitation

0" 1" 2" 3" 3.8"
2.6"
2.64"
Jan
3.6"
3.64"
Feb
3.8"
3.84"
Mar
3.1"
3.13"
Apr
0.5"
0.50"
May
0.0"
0.00"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
0.8"
0.83"
Oct
2.8"
2.77"
Nov
2.7"
2.73"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h14.5h14.5h13.5h12h11h10h9.5h
Jan: 7:10 AM – 4:50 PM · 9h 39m
Feb: 6:42 AM – 5:18 PM · 10h 36m
Mar: 6:09 AM – 5:51 PM · 11h 42m
Apr: 5:30 AM – 6:30 PM · 12h 59m
May: 4:59 AM – 7:01 PM · 14h 02m
Jun: 4:42 AM – 7:18 PM · 14h 36m
Jul: 4:49 AM – 7:11 PM · 14h 22m
Aug: 5:16 AM – 6:44 PM · 13h 28m
Sep: 5:53 AM – 6:07 PM · 12h 14m
Oct: 6:30 AM – 5:30 PM · 10h 60m
Nov: 7:02 AM – 4:58 PM · 9h 55m
Dec: 7:18 AM – 4:42 PM · 9h 24m
Daylight Longest: 14h 37m · Shortest: 9h 23m

Nearby Stations

Livermore Muni AP, CA February 27 - December 1 Livermore, CA February 15 - December 2 Tracy Carbona, CA February 25 - November 26 Antioch Pumping Plt #3, CA January 12 - December 19 Mt Diablo Junction, CA March 8 - December 22 Stockton Fire Stn 4, CA February 5 - December 8

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview