When is the last frost in Mountain View, CA?

The average last spring frost (50% probability of 32°F) in Mountain View is around January 6, based on NOAA/NCEI 1991–2020 normals at the Moffett Federal Airfield, CA station (1.9 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Mountain View?

The average first fall frost in Mountain View, CA is around December 23, giving roughly a 353-day frost-free growing season.

What planting zone is Mountain View, CA?

Mountain View is in USDA plant hardiness zone 9b (average annual extreme minimum temperature 25 to 30°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Mountain View?

In Mountain View, CA the warmest month is September (avg high 79.6°F) and the coldest is December (avg low 38.6°F). It averages about 15.1″ of precipitation a year.

Home › California › Mountain View

Mountain View, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 94041 · elevation 8′ · NOAA & USDA data

Mountain View is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 353 days between the average last spring frost (January 6) and first fall frost (December 23). The warmest month is September (avg high 79.6°F); the coldest is December (avg low 38.6°F). It averages 15.1″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 25 to 30°F

Last spring frost

January 6

avg (50% prob, 32°F)

First fall frost

December 23

avg (50% prob, 32°F)

Growing season

353 days

frost-free window

Warmest month

September

avg high 79.6°F

Month-by-month typical weather in Mountain View

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Palo Alto, CA (5.2 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	57.8	39	48.4	3
February	60.7	41.3	51	3.2
March	65.5	43.6	54.6	2.2
April	69.6	45.3	57.4	1
May	73.3	49.5	61.4	0.4
June	78.5	52.7	65.6	0.1
July	79.4	55.7	67.6	0
August	78.7	55.3	67	0
September	79.6	53	66.3	0.1
October	74	48.4	61.2	0.6
November	63.7	42.5	53.1	1.6
December	57.6	38.6	48.1	3

What to plant when in Mountain View

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: November 25 · Transplant out: January 13
Peppers	warm	Start seeds indoors: November 11 · Transplant out: January 20
Cucumbers	warm	Direct sow: January 13
Zucchini / squash	warm	Direct sow: January 13
Bush beans	warm	Direct sow: January 13
Sweet corn	warm	Direct sow: January 13
Basil	warm	Transplant out: January 13
Peas	cool	Sow (spring): December 2 · Sow (fall): October 28
Spinach	cool	Sow (spring): November 25 · Sow (fall): October 28
Lettuce	cool	Sow (spring): December 9 · Sow (fall): October 28
Kale	cool	Transplant (spring): December 16 · Sow (fall): October 14
Broccoli	cool	Transplant (spring): December 23
Carrots	cool	Sow (spring): December 16 · Sow (fall): October 14
Onions	cool	Transplant (spring): December 9
Potatoes	cool	Plant seed potatoes: December 23
Radishes	cool	Sow (spring): December 9 · Sow (fall): November 11

Dates are computed from Mountain View's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in California

Sunnyvale, CA Palo Alto, CA Cupertino, CA Santa Clara, CA Newark, CA Campbell, CA Redwood City, CA Milpitas, CA

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Moffett Federal Airfield, CA, 1.9 mi (confidence: high). Monthly weather normals: Palo Alto, CA, 5.2 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.