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Colorado Gardener Calendar


Find out about the latest Colorado gardening classes, events, and plant sales here. We will update this page regularly with new events or cancellations.



Denver Rose Society

Thursday, March 9, 7pm-9pm: "Darn Good Fertilizer",  Virtual event

Spenser Thomas - Darn Good Plants, Phoenix, AZ. Join the meeting from your computer, tablet or smartphone. or dial in using your phone - Access Code: 876-070-205

CSU Adams County Extension
2023 Spring Vegetable Garden Series
9755 Henderson Rd, Brighton
Sat 10-noon, $25 + fee
March 25: Container Gardening
Register at
​CSU Extension Free Gardening Webinars
Free online classes from CSU Extension, Wednesdays 12-1. Register at
March 8: Cold Hardy Cacti & Succulents
April 2: Tremendous Tomatoes
Also available on the website, recorded gardening webinars from 2022 & 2021.
Denver Botanic Gardens 

1007 York St, Denver

New Gardener Boot Camp

Onsite: Sat, March 11 9am

Online: Sat, March 22

Learn about garden planning, soils, beginning vegetable gardening annuals & perennials and more. 

$80; $60 members

See for details plus complete class listings, registration information & fees. 

Denver Urban Gardens 

1031 33rd St, Denver,, 303-292-9900

Sat, March 18

10-12, Garden Planning Intensive Workshop

Classes are pay-what-you-can; $30 suggested fee.

Echter's Garden Center
5150 Garrison St, Arvada, CO
Classes on Saturdays; free, no registration required
March 11-Get Your Grow On
10-11 Starting a Lawn from Seed
1-2 This Herb's for You
3-4 Early Spring Punch List
March 18-Gardening Inside & Outdoors
10-11 Orchids-Easier Than You Think
1-2 Turf Maintenance Through the Year
3-4 Trees & Shrubs for Colorado Gardens
Details at 303-4214-7979
The Flower Bin

1805 Nelson Rd, Longmont; 303-772-3454

Spring Begins at the Flower Bin

March 18-19

See for details.

Fort Collins Nursery

2121 E. Mulberry St, Fort Collins, 80524; 970-482-1984

The Gardens on Spring Creek
2145 Centre Ave, Fort Collins
Check or 970-416-2486 to register; all classes on Saturdays, unless otherwise noted.

March 11

10:30-11:30, Composting 101; $18 in person.

1:30-3:30, Vegetable Gardening in Low Water Conditions; $10 virtual.

March 18

1:30-3:30, Wasps! $10 virtual; $18 in person.

March 25

10:30-12:30, Grow Your Own Veggies; $10 virtual, $18 in person.

1:30-3:30, Easy-on-the-Back Raised Bed Gardening; $10 virtual, $18 in person.

Grain School Online 2023 

University of Colo at Colo Spgs.

3 courses; $150 each or $400 for all 3

Online modules with live online sessions; some experiential sessions at UCCS

March 2-31, Health & Nutrition

April 6-28, Community

Register: Grain School 2023

Phelan Gardens

4955 Austin Bluffs Parkway, Colo Springs 80918; 970-560-5486.


Sat, March 11

1:00, Beginning Composting; $10.

Fri, March 24

10:00, Meet the Natives of El Paso County; $10.

Rocky Mt Seed Alliance Online Classes

Details:, 970-560-5486.

Ongoing - Seed School 101 & Grain School 101

Tagawa Gardens

7711 S. Parker Rd., Centennial; 303-690-4722

Classes are free, no registration required. Details at Sign up for the newsletter for info about other classes & special events.



Fri, March 10 - 9th Annual Tree Diversity Conference
Presented by Denver Botanic Gardens & The University of Denver Chester M Alter Arboretum
Denver Botanic Gardens, 1007 York St., Denver, 720-865-3500.
8:30-3 pm--online & in-person options available.
The 9th annual conference explores the relationship between landscape design, horticultural practices & the use of a greater variety of tree species.
$25-$95 for students, public or DBG & CTC membership.
Registration details & speaker bios at
Wed, March 1 - Fri March 31- Envisioning a Changing DurangoScape Conference
Presented by Durango Botanic Gardens
Virtually March 1-31: Watch, listen, learn on your own schedule.
In person March 16 at the Durango Public Library.
This conference offers practical approaches to adapting yards & landscapes to a changing climate. Guest presenter is Panayoti Kelaidis from the Denver Botanic Gardens.
Members $60; nonmembers $75.
Details & registration info:
Fri, March 10 - Sun, March 19 - Great Grow Along
Virtual Gardening Festival
Free 10-day online gardening festival featuring 40 workshops on gardening topics like small space gardening, seeds & soil, native gardening for wildlife landscaping, & more. Details at
Fri, March 17- Sat, March 18 - Sun, Soil, Water, Ag Summit

CSU Extension Pueblo & Pueblo Food Project

Summit includes a Pitch Competition, Leadership Awards, Community Lead Summit, Makers' Market and Idea Fair.
Tix $10-25. For info: 

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