When to plant in Sweet Home, OR
USDA Zone 8bEverything below — frost dates, hardiness zone, and what to plant when in Sweet Home, Oregon — is derived from the closest NOAA station with complete climate normals.
Zone 8b means many perennials and even some tender shrubs overwinter in Sweet Home, while your frost dates still decide when annuals go out.
The average last spring frost in Sweet Home is now 9 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
FOSTER DAM · 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 Sweet Home’s own odds, recorded at FOSTER DAM.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 25 | May 6 | Apr 17 | Sep 14 | Oct 6 | Oct 27 |
| 32°F | May 5 | Apr 12 | Mar 16 | Oct 5 | Oct 28 | Nov 21 |
| 28°F | Apr 11 | Mar 9 | Feb 12 | Oct 25 | Nov 18 | Dec 16 |
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 Sweet Home, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Sweet Home planting FAQ
When is the last spring frost in Sweet Home, OR?
Plan for the last spring frost in Sweet Home around April 12 (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 Sweet Home, OR?
Expect Sweet Home's first fall frost near October 28 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Sweet Home in?
Sweet Home is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Sweet Home?
There are roughly 199 frost-free days in Sweet Home (a moderate growing season), running from the average last frost around April 12 to the first fall frost near October 28.
When should I plant tomatoes in Sweet Home?
In Sweet Home, start tomato seeds indoors around February 15–March 1, then transplant seedlings outdoors around April 19 once the danger of frost has passed.
Never miss a window in Sweet Home
An email when it’s time to start seeds, transplant, and sow — timed to Sweet Home’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lebanon · 22 km
- Albany · 40 km
- Springfield · 45 km
- Santa Clara · 47 km
- Corvallis · 49 km
- Eugene · 51 km
- Four Corners · 62 km
- Salem · 63 km
Frost dates recorded at FOSTER DAM, 3 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 Sweet Home, OR — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00353047. Retrieved from https://blissgarden.com/oregon/sweet-home.