When to plant in Knightdale, NC
USDA Zone 8aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Knightdale, North Carolina — all computed from Knightdale's nearest NOAA weather station.
These dates come from a station roughly 17 km away, the closest with full normals; terrain around Knightdale (elevation, water, pavement) can move your real frost dates a few days either way. Zone 8a means many perennials and even some tender shrubs overwinter in Knightdale, while your frost dates still decide when annuals go out.
Frost probability
CLAYTON WTP · 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 Knightdale’s own odds, recorded at CLAYTON WTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 30 | Apr 18 | Apr 3 | Oct 14 | Oct 26 | Nov 5 |
| 32°F | Apr 20 | Apr 7 | Mar 23 | Oct 22 | Nov 3 | Nov 16 |
| 28°F | Apr 12 | Mar 27 | Mar 7 | Nov 1 | Nov 14 | Dec 1 |
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 Knightdale, 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.
Knightdale planting FAQ
When is the last spring frost in Knightdale, NC?
Knightdale's average last spring frost falls near April 7 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Knightdale, NC?
Expect Knightdale's first fall frost near November 3 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Knightdale in?
Knightdale is in USDA hardiness zone 8a. In zone 8a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Knightdale?
There are roughly 210 frost-free days in Knightdale (a moderate growing season), running from the average last frost around April 7 to the first fall frost near November 3.
When should I plant tomatoes in Knightdale?
In Knightdale, start tomato seeds indoors around February 10–February 24, then transplant seedlings outdoors around April 14 once the danger of frost has passed.
Never miss a window in Knightdale
An email when it’s time to start seeds, transplant, and sow — timed to Knightdale’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Wendell · 13 km
- Raleigh · 14 km
- Rolesville · 14 km
- Clayton · 16 km
- Garner · 16 km
- Wake Forest · 19 km
- Cary · 30 km
- Morrisville · 31 km
Frost dates recorded at CLAYTON WTP, 17 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 Knightdale, NC — Frost Dates & Zone 8a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00311820. Retrieved from https://blissgarden.com/north-carolina/knightdale.