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When to Plant Endive in Fremont County, ID

Endive is a leafy green with a slightly bitter flavor, available in curly (frisee) and broad-leaved (escarole) types. It adds texture and complexity to salads.

Fremont County, Idaho is in USDA Zone 4b. The average last spring frost is June 12 and the first fall frost is September 6, giving you a growing season of approximately 86 days.

At an elevation of 5,282 feet, Fremont County receives approximately 12.7 inches of rainfall annually with predominantly loam soil. Summer highs average 84ยฐF, so choose short-season varieties of Endive to ensure they mature before fall. With low rainfall, drip irrigation is essential for growing Endive successfully. Mulch heavily to conserve soil moisture.

Fremont County, ID (Zone 4b) Very short season
86 days
Last Spring Frost June 12
86 growing days
First Fall Frost September 6

Fremont County Soil Profile

Soil Type

Loam

Soil pH

6.4-8

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (4 days to spare)
Start indoors: Apr 11 Transplant: May 23 🍅 Harvest: Jul 11 – Aug 15
Recommended (50%) ✓ Fits season (2 days to spare)
Start indoors: May 1 Transplant: Jun 12 🍅 Harvest: Jul 31 – Sep 4
Safe Start (90%) ✓ Fits season (14 days to spare)
Start indoors: May 16 Transplant: Jun 27 🍅 Harvest: Aug 15 – Sep 19

Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.

Plant Water Budget

Plant needs
1.0″/week
Rainfall provides
0.6″/week
You supply
0.5″/week
Watering frequency 1-2 times/week
Season total 349 gal / 100 sq ft
Drought risk

Water stress score is 6/10 โ€” consider drought-tolerant varieties and mulching

Endive needs ~715 GDD — county provides 1,118 GDD Excellent fit

Endive Planting Timeline โ€” Fremont County, ID

Endive Planting Calendar

Activity When Date Range
Start Indoors May 1 May 1 โ€“ May 15
Transplant Outdoors June 12 Jun 12 โ€“ Jun 26
Direct Sow June 5 Jun 5 โ€“ Jun 26
Fall Sowing June 14 Jun 14 โ€“ Jun 28
Harvest July 31 Jul 31 โ€“ Sep 4

Plant 0.5" deep ยท 6" apart ยท Rows 12" apart

Month-by-Month Timeline

MonthActivities
January โ€”
February โ€”
March โ€”
April โ€”
May Start Indoors
June Transplant Outdoors Direct Sow Fall Sowing
July Harvest
August Harvest
September Harvest
October โ€”
November โ€”
December โ€”

Growing Conditions

Sun

Partial Shade (3-6 hours)

Water

Moderate โ€” regular watering

Days to Maturity

45โ€“65 days

Soil pH

5.5 โ€“ 7

USDA Zone

Zone 4b

Growing Season

86 days

Growing Tips for Fremont County

Sow seeds directly in spring or fall. Blanch heads by tying outer leaves together 2-3 weeks before harvest to reduce bitterness. Keep soil evenly moist.

Companion Planting

Good Companions

Avoid Planting Near

  • Fennel

Level Up Your Garden

Frequently Asked Questions

When should I plant Endive in Fremont County, ID?

Fremont County is in Zone 4b with an average last frost of June 12. Plan your Endive planting based on this frost date โ€” see the calendar above for exact timing.

What planting zone is Fremont County, ID?

Fremont County, Idaho is in USDA Hardiness Zone 4b. The average last spring frost is June 12 and first fall frost is September 6.

๐ŸŒฑ

Plan Your Garden with Confidence

Get our free Garden Planner โ€” designed to help Fremont County gardeners in Zone 4b organize planting dates, track what's growing, and never miss a planting window.

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Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates are based on 50% probability averages for Fremont County, ID. Local conditions may vary. Last updated: April 2026.