Regional guide

Idaho Zone and Microclimate Vegetable Garden

University of Idaho Extension spring vegetable guide for Idaho gardeners using USDA zones, local microclimates, frost-free days, and zone-specific crop windows.

Regional timing

Current regional planting plan

University of Idaho Extension spring vegetable guide for Idaho gardeners using USDA zones, local microclimates, frost-free days, and zone-specific crop windows.

Source-backed timing University of Idaho Extension Spring Vegetable Planting Guide for Idaho

Idaho Zones 4 climate signals

Source source cues Local conditions

University of Idaho Extension's Spring Vegetable Planting Guide for Idaho says Idaho includes regions representing five different USDA plant hardiness zones, from Zone 3 to Zone 7.
The guide says hardiness zone is one factor, but the combination of hardiness zone and local microclimate dictates planting dates.
Elevation and latitude also impact recommended planting dates, and the guide says actual dates can vary by one to three weeks from the general ranges.

Catalog priority: 27 priority crops
Climate checks: 4 climate signals
Timing basis: Use regional source signals

Source-backed timing University of Idaho Extension's Spring Vegetable Planting Guide for Idaho says Idaho includes regions representing five different USDA plant hardiness zones, from Zone 3 to Zone 7.

The guide says hardiness zone is one factor, but the combination of hardiness zone and local microclimate dictates planting dates.

Crop priority Detroit Dark Red Beet leads the catalog examples

Detroit Dark Red Beet, Waltham 29 Broccoli, Long Island Improved Brussels Sprouts, Golden Acre Cabbage

Next local check Treat University of Idaho's crop rows as Idaho zone and microclimate examples, not as a statewide frost-free date or exact city calendar.

The guide defines cool-season crops as growing best from 50 to 75 degrees F and warm-season crops as growing best from 70 to 85 degrees F.

Calendar Convert regional timing into dated sowing, transplant, and harvest jobs. Frost dates Keep hardiness zone context separate from local first and last frost dates. All regions Compare this guide with the broader regional atlas. Wyoming Statewide University of Wyoming Extension statewide short-season guide for gardens where growing seasons range from short to very short.

Climate signals

University of Idaho Extension's Spring Vegetable Planting Guide for Idaho says Idaho includes regions representing five different USDA plant hardiness zones, from Zone 3 to Zone 7.
The guide says hardiness zone is one factor, but the combination of hardiness zone and local microclimate dictates planting dates.
Elevation and latitude also impact recommended planting dates, and the guide says actual dates can vary by one to three weeks from the general ranges.
The source says a hardiness zone will not tell you how many frost-free days are in a growing season, so gardeners should use average first and last frost dates plus frost-free days when choosing varieties.

Planning notes

Treat University of Idaho's crop rows as Idaho zone and microclimate examples, not as a statewide frost-free date or exact city calendar.
The guide defines cool-season crops as growing best from 50 to 75 degrees F and warm-season crops as growing best from 70 to 85 degrees F.
For short-season areas of Idaho, the guide says many warm-season crops benefit from being started indoors and transplanted after temperatures warm and the last spring frost has passed.
For cool-season rows, Zones 3-4 list beets from May 15 to June 5 and peas from April 17 to May 8; Zones 5-6 list beets from April 27 to May 18 and peas from March 30 to April 20; Zone 7 lists beets from April 17 to May 8 and peas from March 20 to April 10.
For warm-season rows, Zones 3-4 list beans outdoors from June 5 to June 26 and tomatoes started indoors April 3 to April 17 before transplanting June 5 to June 26.
Zones 5-6 list beans outdoors from May 18 to June 8 and tomatoes started indoors March 16 to March 30 before transplanting May 18 to June 8.
Zone 7 lists beans outdoors from May 8 to May 29, tomatoes started indoors March 5 to March 20 before transplanting May 8 to May 29, and Peppers started indoors February 19 to March 5 before transplanting May 15 to June 5.
Use these priority links as crop-level catalog examples for University of Idaho rows, not as named-variety recommendations, potato or sweet potato coverage, a loose bunching-onion match, a cantaloupe-to-muskmelon synonym, or a generic squash-to-winter-squash match.

Catalog crop examples

These catalog entries match crops covered by the regional timing source; variety-specific details remain tied to each seed entry's own source.

Detroit Dark Red Beet Vegetable · Cool · 58 days
Waltham 29 Broccoli Vegetable · Cool · 74 days
Long Island Improved Brussels Sprouts Vegetable · Cool · 100 days
Golden Acre Cabbage Vegetable · Cool · 64 days
Danvers 126 Carrot Vegetable · Shoulder · 70 days
Snowball Y Cauliflower Vegetable · Cool · 70 days
Georgia Southern Collards Vegetable · Cool · 65 days
Lacinato Kale Vegetable · Cool · 60 days
Early White Vienna Kohlrabi Vegetable · Cool · 55 days
American Flag Leek Vegetable · Cool · 120 days
Black Seeded Simpson Lettuce Vegetable · Cool · 45 days
Hollow Crown Parsnip Vegetable · Cool · 120 days
Sugar Snap Pea Vegetable · Cool · 62 days
French Breakfast Radish Vegetable · Cool · 28 days
Bloomsdale Spinach Vegetable · Cool · 42 days
Bright Lights Swiss Chard Vegetable · Shoulder · 55 days
Purple Top White Globe Turnip Vegetable · Cool · 55 days
Provider Bush Bean Vegetable · Warm · 50 days
Tall Utah Celery Vegetable · Cool · 110 days
Golden Bantam Sweet Corn Vegetable · Warm · 80 days
Marketmore 76 Cucumber Vegetable · Warm · 58 days
Black Beauty Eggplant Vegetable · Warm · 80 days
Clemson Spineless Okra Vegetable · Warm · 56 days
California Wonder Pepper Vegetable · Warm · 72 days
Small Sugar Pumpkin Vegetable · Warm · 100 days
Roma Tomato Vegetable · Warm · 76 days
Sugar Baby Watermelon Vegetable · Warm · 80 days

Related regional guides

Wyoming Statewide Short-Season Vegetable Garden University of Wyoming Extension statewide short-season guide for gardens where growing seasons range from short to very short.
New Mexico Growing-Zone Vegetable Garden A New Mexico guide for USDA zones 5a-8b, frost-free-day ranges, site variability, direct seeding, transplant timing, and spring/fall windows.
Montana Frost-Window Vegetable Garden An MSU frost-window guide for Montana's short-season vegetable schedules, local frost dates, direct seeding, transplants, and succession rows.

Source: University of Idaho Extension Spring Vegetable Planting Guide for Idaho