When and Where to Plant Mushrooms Outdoors: A Gardener’s Guide

The simplest way to get your timing right is to think in three steps:

  1. Choose a mushroom group by fruiting temperature

  2. Match that group to your regional climate pattern

  3. Use companion planting and placement to create the right microclimate in your own yard.

This guide is designed for beginner mushroom gardeners who want clear, practical steps and guidance which can be adapted to any location.

Step 1: Pick your mushroom group by temperature

Different mushrooms fruit within different temperature ranges. That fruiting range is your starting point for “when,” because it tells you in which part of the season the mushroom naturally wants to perform. The three groups are cold, moderate, and warm fruiting species:

Cold fruiting species (about 40 to 65 F)

Cold group examples: Snow Oyster, Black King, Nameko, Chestnut, Blewit, Hen of the Woods, Enoki.

Moderate fruiting species (about 55 to 75 F)

Moderate group examples: Shiitake, Blue Oyster, Reishi (both varieties), Pioppino, Italian Oyster, Wine Cap, Chicken of the Woods.

Warm fruiting species (about 65 to 90 F)

Warm group examples: Pink Oyster, Almond Agaricus.

Critical timing note: Almond Agaricus should not be planted until all danger of frost has passed. These species may not survive harsh winters.

Step 2: Identify your climate pattern and use it to choose planting windows

Instead of trying to memorize dates, use a simple climate-pattern lens. These four categories are meant to be practical and are adapted from the more technical Köppen Classification System used by scientists around the world. They describe when your region tends to provide the best growing environment through temperature and moisture. 

Here you see “growing season” ranges and “target inoculation” periods by mushroom temperature group. Treat these as reliable starting points, that along with your species choice, can be further refined using the companion planting and microclimate guidance later in this post.

Microclimates

Microclimates matter, sometimes more than the region you live in. Your local conditions can swing cooler, warmer, wetter, or drier than the average climate depending on shade, wind, slope, nearby water, and heat reflected from pavement or buildings. Treat these planting windows as a starting point, then adjust based on what your site actually does. In especially even-keeled coastal areas (midcoast California, for example), you may have such consistent temps and moisture that inoculations can be possible nearly year-round.

General guidelines for outdoor mushroom cultivation

  1. As soon as soil is workable, mushrooms can go in the ground, except Almond Agaricus, which shouldn’t be planted until all danger of frost has passed.

  2. The substrate should be moist like a wrung out sponge (field capacity).

  3. Mushrooms like as much humidity as possible, ideally between 70-95% (it’s usually considerably higher under plants at the soil level).

  4. Temperatures above 90F can be detrimental and should be offset with moisture and shade as much as possible.

  5. Major fluctuations in temperature and moisture (storms) will often initiate mushroom growth.

Cold-Loving Species
Inoculate between 40°–65°F (4°–18°C)
Chestnut Golden Enoki Snow Oyster Hen of the Woods Black King Nameko Blewit
Wet Summer
Growing SeasonFebruary – November Target InoculationFebruary or October
Arid
Growing SeasonApril – October Target InoculationApril or September
Cold
Growing SeasonSeptember – March Target InoculationSeptember
Wet Winter
Growing SeasonOctober – April Target InoculationOctober
Moderate Species
Inoculate between 55°–75°F (13°–24°C)
Shiitake Blue Oyster Red Reishi Hemlock Reishi Pioppino Italian Oyster Wine Cap Chicken of the Woods
Wet Summer
Growing SeasonFebruary – November Target InoculationMarch or October
Arid
Growing SeasonApril – October Target InoculationMay – September
Cold
Growing SeasonSeptember – March Target InoculationOctober – February
Wet Winter
Growing SeasonOctober – April Target InoculationOctober
Warm-Loving Species
Inoculate between 65°–90°F (18°–32°C)
Pink Oyster Almond Agaricus
Wet Summer
Growing SeasonFebruary – November Target InoculationApril – September
Arid
Growing SeasonApril – October Target InoculationMay – August
Cold
Growing SeasonSeptember – March Target InoculationOctober – November
Wet Winter
Growing SeasonOctober – April Target InoculationMarch – September

Wet winter climates (Prime Planting Season: fall through spring)

Profile: mild summers, most rainfall in the cooler months, so outdoor planting is best from fall through spring when temperatures stay moderate and moisture is naturally available. Much of the west coast falls into this category. Some cities that fit this climate type well are: Sacramento, CA; Eureka, CA; Eugene, OR.


Growing Season: October through April

*Many areas in this climate type have a year-round growing season.   

Cold species

• Target inoculation period: October

Moderate species

• Target inoculation period: October

Warm species

• Target inoculation period: March to September

Wet summer climates (Prime Planting Season: spring through fall)

Profile: warmth and moisture line up in the growing season. It can be humid and rainy in summer, making spring through fall the most reliable window for outdoor planting. Summer can be brutal, but long shoulder seasons are prime. Some cities that fit this regime are: Nashville, TN; Charlotte, NC; Dallas, TX. 

Growing Season: February to November

Cold species

• Target inoculation period: March or October

Moderate species

• Target inoculation period: March or October

Warm species

• Target inoculation period: April to September

Cold climates (Prime Planting Season): late spring through early fall)

Profile: long, freezing winters halt most cultivation and the warm season is short, so outdoor planting should wait until after hard freezes and is best from late spring to early fall. A few cities that fit this climate pattern are: Chicago, IL; Pittsburgh, PA; Portland, ME.

Growing season: April to October

Cold species

• Target inoculation period: April or September

Moderate species

• Target inoculation period: May to September

Warm species

• Target inoculation period: May to August

Arid climates (Prime Planting Season: wet windows)

Profile: arid regions where rainfall is low or inconsistent for much of the year. Additionally, heat can be extreme. Outdoor planting can be most successful during cooler rainy periods, when natural moisture is most dependable. Late summer or early fall (once the heat breaks) through winter or early spring is often best for planting due to cooler temperatures. A few cities that fit this climate type are: Las Vegas, NV; Albuquerque, NM; and Billings, MT. 

Growing season: September to March

Cold species

• Target inoculation period: September

Moderate species

• Target inoculation period: October to February

Warm species

• Target inoculation period: October to November

Step 3: Use companion planting to build the right mushroom microclimate

Companion planting is pairing plants and fungi together in ways that both (or at least the mushrooms) benefit. Though not totally necessary to grow mushrooms outside, it’s an important concept to embrace if you want the best outcomes. Knowing when plants thrive gives you the ability to align them with a mushroom species, providing the best possible environment.

Mushrooms occupy a different niche than vegetables. Instead of competing for sun, they turn shade, leaf litter, and mulch into food. This effectively adds a second harvest layer to the same square footage. Especially when using Plant & Grow Starter Blocks, keep in mind that mushrooms typically grow faster than plants, so plan to plant these after your plant companions have reached partial maturity. 

Here are companion planting principles that directly support outdoor mushroom success:

Plants provide shade, a wind break, and humidity – all things that mushrooms love. 

Great garden companions and placements:

  • Under tall leafy crops like tomatoes and kale, where shade holds moisture at soil level.
  • Beneath perennials and shrubs, where the ground stays cooler and humidity remains higher. This is an ideal place for logs, buckets or beds that will benefit from longer-term sustained shade. 
  • Along the edges of beds, where irrigation overspray or drip lines keep zones consistently damp.

1) Grow mushrooms under living shade

Companion planting is pairing plants and fungi together in ways that both (or at least the mushrooms) benefit. Though not totally necessary to grow mushrooms outside, it’s an important concept to embrace if you want the best outcomes. Knowing when plants thrive gives you the ability to align them with a mushroom species, providing the best possible environment.

Mushrooms occupy a different niche than vegetables. Instead of competing for sun, they turn shade, leaf litter, and mulch into food. This effectively adds a second harvest layer to the same square footage. Especially when using Plant & Grow Starter Blocks, keep in mind that mushrooms typically grow faster than plants, so plan to plant these after your plant companions have reached partial maturity. 

Here are companion planting principles that directly support outdoor mushroom success:

Pink mushrooms with ruffled caps grow on mulch among green leafy plants in a garden setting.

2) Use mulch the way fungi want it used

Many garden-friendly mushrooms feed on decaying organic matter like wood chips and leaves. This is why mulched paths, mulched perennial beds, hugelkultur-style beds, and compost-adjacent areas are often prime fungal real estate.

Mulch benefits for mushrooms:

  • Maintains moisture.
  • Moderates temperature swings.
  • Creates a protected surface layer where humidity stays high.
A hand touching a mixture of soil and wood chips on the ground, next to a wooden log.

3) Match companions to your temperature group

  • Cold species do well with companions and placements that stay cool, like north-facing edges, evergreen windbreaks, and perennial borders.
  • Moderate species integrate easily throughout the garden season, especially in mulched beds and pathways near irrigated crops.
  • Warm species benefit from companions that create humidity and shade during peak heat, like dense summer crops or shrub cover, plus consistent watering.

Universal outdoor rules that make planting windows work

No matter your climate pattern, a few environmental rules drive success.

Plant when the land is workable

As soon as the soil is workable, mushrooms can go in the ground. The exception is Almond Agaricus, which should not be planted until all danger of frost has passed.

Keep substrate at ‘field capacity’

Aim for moisture like a wrung-out sponge, called field capacity. This is the moisture level mushrooms like most wet enough to fuel growth, not so wet that airflow is lost.

Humidity is higher near the ground than you think

Mushrooms like as much humidity as possible, ideally between 70 and 95 percent. Soil-level humidity under plants is often considerably higher than what you feel standing upright in the garden.

Heat above 90 F needs intervention

Temperatures above 90 F can be detrimental and should be offset with moisture and shade as much as possible. Shade cloth, dense garden canopy, thicker mulch, and frequent watering all help.

Weather swings often trigger fruiting

Major fluctuations in temperature and moisture, often from storms, will often initiate mushroom growth. After big rain events or sudden cool-downs, check your beds.

Microclimates matter more than most people expect

Microclimates can matter more than the broader climate region you live in. Shade, wind, slope, nearby water, and heat reflected from pavement or buildings can make your local conditions cooler, warmer, wetter, or drier than the averages. Wild mushrooms are a great example of this. Take note of where and when they’re growing, as this can be a good indicator of suitable microclimates. Treat the planting windows in this post as a starting point, then adjust based on what your site actually does.

In especially stable coastal areas, conditions can be consistent enough that inoculations may be possible nearly year-round!

A simple way to apply this:

  • If your summers run hot, plant in deeper shade than you think you need.
  • If your site is windy, choose sheltered edges or create windbreaks.
  • If your soil dries fast, increase mulch depth and place beds nearer irrigated plantings.

There’s one more option you should consider to create your own microclimate and sustain the best possible mushroom habitat: The MycoSphere

This outdoor grow chamber combines the best aspects of indoor and outdoor cultivation to moderate temperatures and humidity without sacrificing fresh air or protection from pests. With three interchangeable covers and a misting system, the control allows for more mushroom species to be grown in more places and during most (if not all) of the year. Imagine keeping an environment 30 degrees cooler and at 85% humidity, even in the desert!

Several types of mushrooms grow on logs and soil inside a greenhouse, with black North Spore buckets nearby and sunlight streaming in, creating a misty atmosphere.

To bring it back around, the steps we recommend are to pick your mushroom species, understand your regional and local climate (please reference our infographic), and then strategically place your mushrooms, ideally with companion plants. If you’re hoping to grow mushrooms all season, the climate is the first thing you need to understand so that you create a planting timeline involving many species. We hope this guide is helpful with whichever approach you choose. If they’re planted with just a little bit of strategy and love, mushrooms will give you fruitful harvests again and again!