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Plant Nurseries & Garden Centers in Castle Rock, CO

Where to buy plants here

Where to buy plants in Castle Rock, CO: big-box vs. independent

Castle Rock, CO has 7 independent nurseries and 7 big-box garden centers in this directory's own classification. Independent, big-box, and grower are separate business-structure categories on file for each listing, not a ranking of one over another.

Independent, named

Plus 4 more in the listings below.

Big-box, named

Plus 4 more in the listings below.

Growing conditions

USDA hardiness zone
5b
Avg. minimum winter temp
-15°F
Median frost dates
First ~Oct 2 · Last ~May 9

Frost dates: NOAA 1991–2020 Climate Normals, nearest station (CASTLE ROCK, CO US, 4.9 km away) .

What's plantable right now

Based on this ZIP's median frost dates, last frost ~May 9, first frost ~Oct 2.

Direct-sow now

  • Basil · 14–75 days to maturity

Planting-window sources: , Clemson Cooperative Extension, Home & Garden Information Center , Colorado State University Extension, Colorado Master Gardener Program , NC State Extension .

Planting windows and crop timing here are computed from USDA/NOAA climate data and the university extension sources cited below, not a site visit or soil test. Treat this as a starting point: local conditions vary, and a local nursery or extension office can advise on your exact site. See our full Disclaimer.

Map data © OpenStreetMap contributors.

Big Box Big Box

The Home Depot

3.9 ★ (1,210 Google reviews) as of 2026-08-06

333 W Allen St, Castle Rock, CO 80108

Licence: not checked, no CO registry held

Call Directions Website

Planting calendar

The full year, at a glance

Number of crops in our table with an open planting window each month, computed from this ZIP's median frost dates.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Start indoors 1 1 8 – – – – – – – – –
Direct-sow – – – 17 12 2 1 1 1 – – –
Transplant – – – 5 15 – – – – – – –
Fall planting – – – – – – – 11 – – – –

Keep looking nearby

Nurseries near Castle Rock

Related guides

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