When to plant in Grain Valley, MO
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Grain Valley, Missouri — all computed from Grain Valley's nearest NOAA weather station.
In zone 6b, Grain Valley gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
LEES SUMMIT MUNI AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Grain Valley’s own odds, recorded at LEES SUMMIT MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 4 | Apr 19 | Apr 3 | Oct 2 | Oct 19 | Nov 1 |
| 32°F | Apr 24 | Apr 7 | Mar 21 | Oct 14 | Oct 29 | Nov 12 |
| 28°F | Apr 11 | Mar 28 | Mar 10 | Oct 24 | Nov 7 | Nov 24 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Grain Valley, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Grain Valley planting FAQ
When is the last spring frost in Grain Valley, MO?
On average, the last spring frost in Grain Valley is around April 7 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Grain Valley, MO?
In Grain Valley, the first 32°F freeze of fall lands around October 29 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Grain Valley in?
Grain Valley is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Grain Valley?
Grain Valley has about 205 frost-free days — a moderate growing season — between the average last spring frost (April 7) and first fall frost (October 29).
When should I plant tomatoes in Grain Valley?
For Grain Valley, sow tomatoes indoors about February 10–February 24 and move the seedlings out around April 14, after the last spring frost.
Never miss a window in Grain Valley
An email when it’s time to start seeds, transplant, and sow — timed to Grain Valley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Blue Springs · 4 km
- Independence · 14 km
- Lee's Summit · 18 km
- Raytown · 21 km
- Grandview · 30 km
- Liberty · 31 km
- Kansas City · 31 km
- Raymore · 32 km
Frost dates recorded at LEES SUMMIT MUNI AP, 15 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Grain Valley, MO — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00053879. Retrieved from https://blissgarden.com/missouri/grain-valley.