When is the last frost in Aurora, CO?

The average last spring frost (50% probability of 32°F) in Aurora is around May 4, based on NOAA/NCEI 1991–2020 normals at the Denver-stapleton, CO station (1.7 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 Aurora?

The average first fall frost in Aurora, CO is around October 8, giving roughly a 156-day frost-free growing season.

What planting zone is Aurora, CO?

Aurora is in USDA plant hardiness zone 6a (average annual extreme minimum temperature -10 to -5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Aurora?

In Aurora, CO the warmest month is July (avg high 90.2°F) and the coldest is January (avg low 17.6°F). It averages about 15.4″ of precipitation a year and 49″ of snow.

Home › Colorado › Aurora

Aurora, CO Planting Calendar & Frost Dates

USDA hardiness zone 6a · ZIP 80010 · elevation 1611′ · NOAA & USDA data

Aurora is in USDA hardiness zone 6a (winters can dip to -10 to -5°F), with a growing season of about 156 days between the average last spring frost (May 4) and first fall frost (October 8). The warmest month is July (avg high 90.2°F); the coldest is January (avg low 17.6°F). It averages 15.4″ of precipitation a year and 49″ of snow, mostly mid-winter. 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 -10 to -5°F

Last spring frost

May 4

avg (50% prob, 32°F)

First fall frost

October 8

avg (50% prob, 32°F)

Growing season

156 days

frost-free window

Warmest month

July

avg high 90.2°F

Month-by-month typical weather in Aurora

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Denver-stapleton, CO (1.7 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	46.5	17.6	32.1	0.5	6.4
February	47.5	19.3	33.4	0.5	7.6
March	56.4	27.1	41.8	1.1	8.8
April	62.5	33.7	48.1	1.7	6.2
May	71.7	43.4	57.6	2.3	1.4
June	84.1	52.9	68.5	1.7	0
July	90.2	59.3	74.8	2.1	0
August	87.9	57.2	72.5	1.8	0
September	80.1	48.2	64.2	1.5	0.8
October	66.7	35.7	51.2	1	3.9
November	54.8	25.5	40.2	0.7	7.3
December	45.9	17.7	31.8	0.5	6.6

What to plant when in Aurora

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 23 · Transplant out: May 11
Peppers	warm	Start seeds indoors: March 9 · Transplant out: May 18
Cucumbers	warm	Direct sow: May 11
Zucchini / squash	warm	Direct sow: May 11
Bush beans	warm	Direct sow: May 11
Sweet corn	warm	Direct sow: May 11
Basil	warm	Transplant out: May 11
Peas	cool	Sow (spring): March 30 · Sow (fall): August 13
Spinach	cool	Sow (spring): March 23 · Sow (fall): August 13
Lettuce	cool	Sow (spring): April 6 · Sow (fall): August 13
Kale	cool	Transplant (spring): April 13 · Sow (fall): July 30
Broccoli	cool	Transplant (spring): April 20
Carrots	cool	Sow (spring): April 13 · Sow (fall): July 30
Onions	cool	Transplant (spring): April 6
Potatoes	cool	Plant seed potatoes: April 20
Radishes	cool	Sow (spring): April 6 · Sow (fall): August 27

Dates are computed from Aurora'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 Colorado

Denver, CO Commerce City, CO Westminster, CO Littleton, CO Arvada, CO Thornton, CO Broomfield, CO Parker, CO

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 — Denver-stapleton, CO, 1.7 mi (confidence: high). Monthly weather normals: Denver-stapleton, CO, 1.7 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.