When to plant Sweet Pea in Big Stone County County,
Plant Sweet Pea in Big Stone County County from March 28 to April 18 in spring. Big Stone County County sits in USDA Zone 4b, with last frost around May 2 and first frost on October 4.
When to Plant Sweet Pea in Big Stone County, MN
What to do in June
If you only do a handful of things in the garden this June, make it these. They're sequenced around your zone's frost timing.
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Start sweet pea indoors
A seed-starting mix and a sunny window (or a grow light) are all you need. Keep soil warm — around 70°F — for fast germination.
To set up a strong July, finish these tasks
- First harvests: sweet pea
Sweet peas (Lathyrus odoratus) are beloved cool-season climbing annuals grown primarily for their intensely fragrant, ruffled blooms in shades of pink, purple, red, and white. They thrive in cool spring conditions, climbing trellises to 4–6 feet, and make outstanding cut flowers. Bloom ceases once summer heat arrives, making early sowing critical for a long cutting season.
Big Stone County, Minnesota is in USDA Zone 4b. The average last spring frost is May 2 and the first fall frost is October 4, giving you a growing season of approximately 155 days.
At an elevation of 823 feet, Big Stone County receives approximately 32.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 81°F, so choose short-season varieties of Sweet Pea to ensure they mature before fall.
Big Stone County Soil Profile
Soil Type
Silt Loam
Soil pH
6.1-7.3
Drainage
Well Drained
Sweet Pea 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 Big Stone County
How your county's soil matches Sweet Pea's growing requirements.
Soil pH
Your soil pH (6.1–7.3) is more acidic than Sweet Pea prefers (7.0–7.5). Add garden lime to raise pH.
Soil Texture
The silt loam soil in Big Stone County is excellent for Sweet Pea — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Sweet Pea.
Organic Matter
Organic matter is excellent (4.5%) — Sweet Pea will thrive.
How to Plant Sweet Pea
Succession Planting Sweet Pea
Sow every 7.4 weeks. Last sowing by Jul 11 to harvest before frost.
Sweet Pea Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Sweet Pea
Sweet Pea needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Sweet Pea Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | — | 1.4" | 0" | ❄️ Dormant |
| Mar | — | 2.6" | 0" | ❄️ Dormant |
| Apr | — | 2.9" | 0" | ❄️ Dormant |
| May | 4.3" | 3.8" | 0.5" | 💧 Light watering |
| Jun | 4.3" | 4.7" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 3.4" | 0.9" | 💧 Light watering |
| Aug | 4.3" | 3.2" | 1.1" | 💧 Light watering |
| Sep | 4.3" | 3.1" | 1.2" | 💧 Light watering |
| Oct | 4.3" | 2.3" | 2" | 💧 Light watering |
| Nov | — | 2" | 0" | ❄️ Dormant |
| Dec | — | 1.6" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Oct in Big Stone County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Sweet Pea 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.
Sweet Pea Planting Timeline — Big Stone County, MN
Sweet Pea Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 21 | Mar 21 – Apr 4 |
| Transplant Outdoors | May 2 | May 2 – May 16 |
| Direct Sow | March 28 | Mar 28 – Apr 18 |
| Bloom | July 25 | Jul 25 – Sep 12 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors Direct Sow |
| April | Start Indoors Direct Sow |
| May | Transplant Outdoors |
| June | — |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · 1-2 times/week
📅 Days to Maturity
65–85 days
🧪 Soil pH
Needs 7–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 4b
📆 Growing Season
155 days in Big Stone County
Growing Tips for Sweet Pea in Big Stone County
Direct sow Sweet Pea outdoors after May 02 in Big Stone County when soil has warmed and frost danger has passed.
Common pests for Sweet Pea in this region include bean beetles and aphids. Use row covers early in the season and inspect plants weekly.
General growing tips
Soak seeds 24 hours before sowing to soften the hard seed coat; nick the seed coat with a file for the fastest germination. In cold zones (2–6), direct-sow as soon as soil can be worked, 4–6 weeks before last frost; seedlings tolerate light frost but not a hard freeze. In zones 7–9, fall-sow 8–10 weeks before first frost for earlier, stronger spring bloom. Provide a trellis or netting from the start. Feed with low-nitrogen, high-potassium fertilizer once buds form. Pick blooms regularly — even one mature seed pod stops flower production. All plant parts are mildly toxic if eaten.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Sweet Pea in Other Locations
Frequently Asked Questions
When should I plant Sweet Pea in Big Stone County, MN?
Big Stone County is in Zone 4b with an average last frost of May 2. Plan your Sweet Pea planting based on this frost date — see the calendar above for exact timing.
What planting zone is Big Stone County, MN?
Big Stone County, Minnesota is in USDA Hardiness Zone 4b. The average last spring frost is May 2 and first fall frost is October 4.
When should I plant Sweet Pea in Big Stone County County, ?
In Big Stone County County, , plant Sweet Pea after the last frost (around May 2) and before the first frost (around October 4). Best results when soil holds above 50°F.
What growing zone is Big Stone County County, for Sweet Pea?
Big Stone County County sits in USDA Zone 4b. Sweet Pea grows reliably in zones 2a through 9b, so it's a good fit here.
Can Sweet Pea grow in Big Stone County County's climate?
Yes — Sweet Pea grows well in Big Stone County County's temperate climate. Big Stone County County averages a 155-day frost-free season, with last frost around May 2 and first frost around October 4.
Your Big Stone County Garden Planner — Free
A 22-page printable planner built for Big Stone County (Zone 4b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.