When is the last frost in Morgan Hill, CA?

The average last spring frost (50% probability of 32°F) in Morgan Hill is around February 24, based on NOAA/NCEI 1991–2020 normals at the Gilroy, CA station (11.1 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 Morgan Hill?

The average first fall frost in Morgan Hill, CA is around November 27, giving roughly a 277-day frost-free growing season.

What planting zone is Morgan Hill, CA?

Morgan Hill 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 Morgan Hill?

In Morgan Hill, CA the warmest month is July (avg high 87.2°F) and the coldest is December (avg low 37°F). It averages about 19.8″ of precipitation a year.

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Morgan Hill, CA Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 95037 · elevation 59′ · NOAA & USDA data

Morgan Hill is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 277 days between the average last spring frost (February 24) and first fall frost (November 27). The warmest month is July (avg high 87.2°F); the coldest is December (avg low 37°F). It averages 19.8″ 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

February 24

avg (50% prob, 32°F)

First fall frost

November 27

avg (50% prob, 32°F)

Growing season

277 days

frost-free window

Warmest month

July

avg high 87.2°F

Month-by-month typical weather in Morgan Hill

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Gilroy, CA (11.1 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	60.7	38.1	49.4	4.6
February	64	40.4	52.2	4.3
March	68.1	42.6	55.3	2.6
April	71.9	44.5	58.2	1.3
May	77.3	49	63.1	0.6
June	82.8	51.6	67.2	0.2
July	87.2	54	70.6	0
August	87.2	54.4	70.8	0
September	84.9	52.5	68.7	0
October	78.8	47.9	63.4	0.9
November	68.3	41.6	55	1.7
December	60.4	37	48.7	3.7

What to plant when in Morgan Hill

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 13 · Transplant out: March 3
Peppers	warm	Start seeds indoors: December 30 · Transplant out: March 10
Cucumbers	warm	Direct sow: March 3
Zucchini / squash	warm	Direct sow: March 3
Bush beans	warm	Direct sow: March 3
Sweet corn	warm	Direct sow: March 3
Basil	warm	Transplant out: March 3
Peas	cool	Sow (spring): January 20 · Sow (fall): October 2
Spinach	cool	Sow (spring): January 13 · Sow (fall): October 2
Lettuce	cool	Sow (spring): January 27 · Sow (fall): October 2
Kale	cool	Transplant (spring): February 3 · Sow (fall): September 18
Broccoli	cool	Transplant (spring): February 10
Carrots	cool	Sow (spring): February 3 · Sow (fall): September 18
Onions	cool	Transplant (spring): January 27
Potatoes	cool	Plant seed potatoes: February 10
Radishes	cool	Sow (spring): January 27 · Sow (fall): October 16

Dates are computed from Morgan Hill'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

Gilroy, CA San Jose, CA Watsonville, CA Campbell, CA Santa Clara, CA Santa Cruz, CA Milpitas, CA Cupertino, 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 — Gilroy, CA, 11.1 mi (confidence: medium). Monthly weather normals: Gilroy, CA, 11.1 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.