When to Plant Spinach in Yukon-Koyukuk Census Area, AK
May in the garden — Yukon-Koyukuk Census Area, Alaska
Welcome to May in Zone 2a. These are the moves that will have the biggest impact on your growing season.
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Get spinach in the ground
Frost risk is low now in Yukon-Koyukuk Census Area, Alaska. If you've been covering beds overnight, you can stop.
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Sow spinach where they'll grow
Your soil is 43°F — warm enough for these to germinate without babying.
Before June arrives, get these ready
- Fall sowing: spinach
Spinach is a nutrient-packed cool-season green that grows quickly in spring and fall. It is rich in iron, vitamins, and antioxidants and excellent raw or cooked.
Yukon-Koyukuk Census Area, Alaska is in USDA Zone 2a. The average last spring frost is May 29 and the first fall frost is August 26, giving you a growing season of approximately 89 days.
At an elevation of 2,163 feet, Yukon-Koyukuk Census Area receives approximately 55.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 69°F, so choose short-season varieties of Spinach to ensure they mature before fall. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Spinach root diseases.
Yukon-Koyukuk Census Area Soil Profile
Soil Type
Silt Loam
Soil pH
5-6.5
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.
Soil Compatibility in Yukon-Koyukuk Census Area
How your county's soil matches Spinach's growing requirements.
Soil pH
Your soil pH (5.0–6.5) is more acidic than Spinach prefers (6.5–7.5). Add garden lime to raise pH.
Soil Texture
The silt loam soil in Yukon-Koyukuk Census Area is excellent for Spinach — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Spinach.
Organic Matter
Organic matter is excellent (5.8%) — Spinach will thrive.
How to Plant Spinach
Fall planting: Sow 12 weeks before your first frost date for a fall harvest.
Succession Planting Spinach
Sow every 4 weeks. Last sowing by Jul 07 to harvest before frost.
For a dedicated fall crop, sow by Jun 03.
Plant Water Budget
Monthly Watering Guide for Spinach
Spinach needs approximately 0.7 inches of water per week (3" per month). Here's how your county's rainfall compares month by month.
| Month | Spinach Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2.8" | 0" | ❄️ Dormant |
| Feb | — | 2.2" | 0" | ❄️ Dormant |
| Mar | — | 2.4" | 0" | ❄️ Dormant |
| Apr | — | 1.8" | 0" | ❄️ Dormant |
| May | 3" | 2.4" | 0.6" | 💧 Light watering |
| Jun | 3" | 3.7" | 0" | ✅ Rainfall sufficient |
| Jul | 3" | 6.8" | 0" | ✅ Rainfall sufficient |
| Aug | 3" | 7.8" | 0" | ✅ Rainfall sufficient |
| Sep | — | 9.3" | 0" | ❄️ Dormant |
| Oct | — | 8.2" | 0" | ❄️ Dormant |
| Nov | — | 4.3" | 0" | ❄️ Dormant |
| Dec | — | 4.1" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Aug in Yukon-Koyukuk Census Area). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Spinach Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Spinach Planting Timeline — Yukon-Koyukuk Census Area, AK
Spinach Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | April 17 | Apr 17 – May 1 |
| Transplant Outdoors | May 29 | May 29 – Jun 12 |
| Direct Sow | May 22 | May 22 – Jun 12 |
| Harvest | July 3 | Jul 3 – Sep 4 |
| Fall Sowing | June 3 | Jun 3 – Jun 17 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Start Indoors |
| May | Start Indoors Transplant Outdoors Direct Sow |
| June | Transplant Outdoors Direct Sow Fall Sowing |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.7"/week · Natural rainfall sufficient
📅 Days to Maturity
35–50 days
🧪 Soil pH
Needs 6.5–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 2a
📆 Growing Season
89 days in Yukon-Koyukuk Census Area
Growing Tips for Spinach in Yukon-Koyukuk Census Area
Direct sow Spinach outdoors after May 29 in Yukon-Koyukuk Census Area when soil has warmed and frost danger has passed.
General growing tips
Direct sow as soon as soil can be worked in spring. Plant in partial shade for summer crops to delay bolting. Succession plant every 2 weeks for continuous harvest.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Wind pollinated — isolate 1/2 mile for purity. Easy to let bolt in heat.
Spinach in Other Locations
Frequently Asked Questions
When should I plant Spinach in Yukon-Koyukuk Census Area, AK?
Yukon-Koyukuk Census Area is in Zone 2a with an average last frost of May 29. Plan your Spinach planting based on this frost date — see the calendar above for exact timing.
What planting zone is Yukon-Koyukuk Census Area, AK?
Yukon-Koyukuk Census Area, Alaska is in USDA Hardiness Zone 2a. The average last spring frost is May 29 and first fall frost is August 26.
Your Yukon-Koyukuk Census Area Garden Planner — Free
A 24-page printable planner built for Yukon-Koyukuk Census Area (Zone 2a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.