When is the last frost in Loveland, CO?

The average last spring frost (50% probability of 32°F) in Loveland is around May 12, based on NOAA/NCEI 1991–2020 normals at the Waterdale, CO station (3 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 Loveland?

The average first fall frost in Loveland, CO is around October 1, giving roughly a 141-day frost-free growing season.

What planting zone is Loveland, CO?

Loveland is in USDA plant hardiness zone 5b (average annual extreme minimum temperature -15 to -10°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Loveland?

In Loveland, CO the warmest month is July (avg high 86.6°F) and the coldest is January (avg low 14.9°F). It averages about 16.8″ of precipitation a year and 40″ of snow.

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Loveland, CO Planting Calendar & Frost Dates

USDA hardiness zone 5b · ZIP 80537 · elevation 1594′ · NOAA & USDA data

Loveland is in USDA hardiness zone 5b (winters can dip to -15 to -10°F), with a growing season of about 141 days between the average last spring frost (May 12) and first fall frost (October 1). The warmest month is July (avg high 86.6°F); the coldest is January (avg low 14.9°F). It averages 16.8″ of precipitation a year and 40″ 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 -15 to -10°F

Last spring frost

May 12

avg (50% prob, 32°F)

First fall frost

October 1

avg (50% prob, 32°F)

Growing season

141 days

frost-free window

Warmest month

July

avg high 86.6°F

Month-by-month typical weather in Loveland

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Waterdale, CO (3 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	43.5	14.9	29.2	0.5	5.1
February	44.6	16.6	30.6	0.6	7.2
March	53.5	24.7	39.1	1.2	6.3
April	59.8	31.2	45.5	1.9	4.7
May	68.3	40.8	54.5	3	0.7
June	80.3	48.8	64.5	1.7	0
July	86.6	54.6	70.6	1.9	0
August	84	53.2	68.6	1.7	0
September	76.4	45	60.7	1.7	0.8
October	63.3	33.6	48.4	1.2	2.8
November	51.4	23.9	37.6	0.8	6
December	43.1	15.5	29.3	0.5	6.4

What to plant when in Loveland

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 31 · Transplant out: May 19
Peppers	warm	Start seeds indoors: March 17 · Transplant out: May 26
Cucumbers	warm	Direct sow: May 19
Zucchini / squash	warm	Direct sow: May 19
Bush beans	warm	Direct sow: May 19
Sweet corn	warm	Direct sow: May 19
Basil	warm	Transplant out: May 19
Peas	cool	Sow (spring): April 7 · Sow (fall): August 6
Spinach	cool	Sow (spring): March 31 · Sow (fall): August 6
Lettuce	cool	Sow (spring): April 14 · Sow (fall): August 6
Kale	cool	Transplant (spring): April 21 · Sow (fall): July 23
Broccoli	cool	Transplant (spring): April 28
Carrots	cool	Sow (spring): April 21 · Sow (fall): July 23
Onions	cool	Transplant (spring): April 14
Potatoes	cool	Plant seed potatoes: April 28
Radishes	cool	Sow (spring): April 14 · Sow (fall): August 20

Dates are computed from Loveland'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

Fort Collins, CO Longmont, CO Boulder, CO Greeley, CO Broomfield, CO Thornton, CO Westminster, CO Arvada, 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 — Waterdale, CO, 3 mi (confidence: high). Monthly weather normals: Waterdale, CO, 3 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.