When to Plant Shiso in Weston County, WY
Shiso (perilla) is a fragrant Japanese herb with large, ruffled leaves in green or purple varieties. It has a unique flavor combining mint, basil, and anise.
Weston County, Wyoming is in USDA Zone 4a. The average last spring frost is May 16 and the first fall frost is September 26, giving you a growing season of approximately 133 days.
At an elevation of 5,889 feet, Weston County receives approximately 20.7 inches of rainfall annually with predominantly loam soil. Summer highs average 81°F, so choose short-season varieties of Shiso to ensure they mature before fall.
Weston County Soil Profile
Soil Type
Loam
Soil pH
6.7-7.7
Drainage
Well Drained
Plant Planting Risk Windows
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
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Shiso Planting Timeline — Weston County, WY
Shiso Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 21 | Mar 21 – Apr 4 |
| Transplant Outdoors | June 6 | Jun 6 – Jun 20 |
| Direct Sow | May 23 | May 23 – Jun 13 |
| Harvest | August 1 | Aug 1 – Sep 26 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors |
| May | Direct Sow |
| June | Transplant Outdoors Direct Sow |
| July | — |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Partial Shade (3-6 hours)
Water
Moderate — regular watering
Days to Maturity
50–70 days
Soil pH
5.5 – 7
USDA Zone
Zone 4a
Growing Season
133 days
Growing Tips for Weston County
Direct sow after last frost or start indoors. Both green and red varieties are available. Pinch tips to encourage bushiness. Self-sows prolifically; deadhead to control.
Companion Planting
Good Companions
Level Up Your Garden
Shiso in Other Locations
Frequently Asked Questions
When should I plant Shiso in Weston County, WY?
Weston County is in Zone 4a with an average last frost of May 16. Plan your Shiso planting based on this frost date — see the calendar above for exact timing.
What planting zone is Weston County, WY?
Weston County, Wyoming is in USDA Hardiness Zone 4a. The average last spring frost is May 16 and first fall frost is September 26.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Weston County gardeners in Zone 4a organize planting dates, track what's growing, and never miss a planting window.
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