When to plant in Hannibal, MO
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Hannibal, Missouri — all computed from Hannibal's nearest NOAA weather station.
Zone 6a means Hannibal sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
HANNIBAL WTR WKS · 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 Hannibal’s own odds, recorded at HANNIBAL WTR WKS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 6 | Apr 21 | Apr 6 | Oct 2 | Oct 18 | Oct 30 |
| 32°F | Apr 25 | Apr 10 | Mar 28 | Oct 14 | Oct 27 | Nov 9 |
| 28°F | Apr 15 | Mar 31 | Mar 14 | Oct 23 | Nov 5 | Nov 21 |
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 Hannibal, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Hannibal planting FAQ
When is the last spring frost in Hannibal, MO?
Plan for the last spring frost in Hannibal around April 10 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Hannibal, MO?
Expect Hannibal's first fall frost near October 27 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Hannibal in?
Hannibal is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Hannibal?
There are roughly 200 frost-free days in Hannibal (a moderate growing season), running from the average last frost around April 10 to the first fall frost near October 27.
When should I plant tomatoes in Hannibal?
In Hannibal, start tomato seeds indoors around February 13–February 27, then transplant seedlings outdoors around April 17 once the danger of frost has passed.
Never miss a window in Hannibal
An email when it’s time to start seeds, transplant, and sow — timed to Hannibal’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Quincy · 25 km
- Mexico · 74 km
- Troy · 90 km
- Moberly · 95 km
- Jacksonville · 99 km
- Fort Madison · 101 km
- Macomb · 104 km
- Fulton · 106 km
Frost dates recorded at HANNIBAL WTR WKS, 2 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 Hannibal, MO — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00233601. Retrieved from https://blissgarden.com/missouri/hannibal.