When to plant Astilbe in Nome Census Area, AK
Plant Astilbe in Nome Census Area during the brief June 17–July 1 window. With 91 frost-free days, fall plantings can't mature before September 2.
When to Plant Astilbe in Nome Census Area, AK
Astilbe (Astilbe x arendsii) is a premier perennial for shaded, moist gardens, producing feathery plume-like flower spikes in shades of pink, red, white, and lavender above deeply cut, ferny foliage. Originating in Asia and naturalized in shade gardens worldwide, astilbe thrives where many sun-lovers fail: under trees, beside water features, or in persistently moist woodland borders. The dried flower plumes remain attractive through fall and winter. Different cultivars extend the bloom season from early summer through early fall when several varieties are combined.
Nome Census Area, Alaska is in USDA Zone 3b. The average last spring frost is June 3 and the first fall frost is September 2, giving you a growing season of approximately 91 days.
At an elevation of 2,593 feet, Nome Census Area receives approximately 39.9 inches of rainfall annually with predominantly silt loam soil. Summer highs average 61°F, so choose short-season varieties of Astilbe to ensure they mature before fall.
Nome Census Area Soil Profile
Soil Type
Silt Loam
Soil pH
5-6.7
Drainage
Well Drained
Monthly Watering Guide for Astilbe
Astilbe needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Astilbe Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2" | 0" | ❄️ Dormant |
| Feb | — | 1.8" | 0" | ❄️ Dormant |
| Mar | — | 1.4" | 0" | ❄️ Dormant |
| Apr | — | 1.4" | 0" | ❄️ Dormant |
| May | — | 1.8" | 0" | ❄️ Dormant |
| Jun | 4.3" | 3.2" | 1.1" | 💧 Light watering |
| Jul | 4.3" | 5.2" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 6.1" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 6.5" | 0" | ✅ Rainfall sufficient |
| Oct | — | 4.8" | 0" | ❄️ Dormant |
| Nov | — | 3.2" | 0" | ❄️ Dormant |
| Dec | — | 2.6" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Jun–Sep in Nome Census Area). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Astilbe Planting Timeline — Nome Census Area, AK
Astilbe Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 25 | Mar 25 – Apr 8 |
| Transplant Outdoors | June 17 | Jun 17 – Jul 1 |
| Bloom | September 9 | Sep 9 – Oct 28 |
Plant 1.5" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors |
| May | — |
| June | Transplant Outdoors |
| July | Transplant Outdoors |
| August | — |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
High — keep soil consistently moist
📅 Days to Maturity
70–100 days
🧪 Soil pH
Needs 6–8 · Your soil: N/A
🗺️ USDA Zone
Zone 3b
📆 Growing Season
91 days in Nome Census Area
Growing Tips for Nome Census Area
Plant bare-root crowns in spring as soon as the ground is workable, setting eyes 1–2 inches below soil level. Fall planting (Zones 4+) is equally effective. Consistent moisture is non-negotiable — astilbe will wilt and scorch in drought. Amend with generous compost to improve moisture retention. Partial shade (morning sun, afternoon shade) is ideal; deep shade reduces bloom but foliage remains. Fertilize lightly in spring with a balanced slow-release granular. Divide every 3–5 years in early spring as clumps become congested. Leave plumes standing through winter for ornamental interest and wildlife value. Year 2+ plants produce the fullest bloom spikes; first-year crowns may flower lightly or not at all.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Astilbe in Other Locations
Frequently Asked Questions
When should I plant Astilbe in Nome Census Area, AK?
Nome Census Area is in Zone 3b with an average last frost of June 3. Plan your Astilbe planting based on this frost date — see the calendar above for exact timing.
What planting zone is Nome Census Area, AK?
Nome Census Area, Alaska is in USDA Hardiness Zone 3b. The average last spring frost is June 3 and first fall frost is September 2.
When should I plant Astilbe in Nome Census Area, AK?
In Nome Census Area, AK, plant Astilbe after the last frost (around June 3) and before the first frost (around September 2). Best results when soil holds above 50°F.
What growing zone is Nome Census Area, AK for Astilbe?
Nome Census Area sits in USDA Zone 3b. Astilbe grows reliably in zones 3a through 8b, so it's a good fit here.
Can Astilbe grow in Nome Census Area's climate?
Yes — Astilbe grows well in Nome Census Area's temperate climate. Nome Census Area averages a 91-day frost-free season, with last frost around June 3 and first frost around September 2.
Your Nome Census Area Garden Planner — Free
A 22-page printable planner built for Nome Census Area (Zone 3b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.