Weather in Keizer, Oregon
Shoots and Sprouts Rise in Ranks. Day 58 of spring. Read this microseason across nine climate regions →
- TodayMay 16Drizzle30%58°45°
- SundayMay 17Light Drizzle20%64°41°
- MondayMay 18Overcast—69°45°
- TuesdayMay 19Overcast—68°43°
- WednesdayMay 20Overcast—70°40°
- ThursdayMay 21Mostly Clear—80°46°
- FridayMay 22Overcast—75°46°
- PM 2.5
- 2.8 μg/m³
- PM 10
- 4.9 μg/m³
- NO₂
- 0.3 μg/m³
- Ozone
- 72.0 μg/m³
- UV Index
- 1.8 Low
Flowers blooming in late autumn, a sure sign of a bad winter coming.
- Moonrise
- 12:03 PM
- Moonset
- 2:58 AM
- In sign
- ♉︎ Taurus
Shoots and Sprouts Rise in Ranks
Keizer at a glance
- Today vs. normal: 11°F below the seasonal normal for this latitude
- Last frost: May 16 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Cool-season window is open
As of May 16, the cool-season window is open or about to open. Direct-sow peas, lettuce, spinach, radishes, and brassicas now. Hold off on warm-season crops until 1–2 weeks after the last spring frost (around May).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Keizer's warmest month is July (~69°F mean) and its coldest is December (~41°F). Rainfall peaks in December (7.0 inches) and bottoms out in July (0.3 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 42° | 6.1″ | 13 |
| February | 44° | 4.5″ | 10 |
| March | 48° | 4.3″ | 11 |
| April | 51° | 3.1″ | 10 |
| May | 58° | 2.3″ | 6 |
| June | 63° | 1.3″ | 4 |
| July | 69° | 0.3″ | 1 |
| August | 69° | 0.4″ | 1 |
| September | 64° | 1.5″ | 3 |
| October | 54° | 3.5″ | 7 |
| November | 46° | 6.0″ | 12 |
| December | 41° | 7.0″ | 13 |
Regional context
Keizer sits within a warm-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Portland, OR, Eugene, OR, Salem, OR, Medford, OR, Bend, OR.
Frequently asked
- When does it freeze in Keizer?
- Keizer's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Keizer?
- December is the wettest month with about 7.0 inches of rain on average; the city receives roughly 40 inches annually.
- What is the warmest month in Keizer?
- July is typically warmest, averaging about 69°F.
- What is the coldest month in Keizer?
- December is typically coldest, averaging about 41°F.
- When can I start a vegetable garden in Keizer?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Keizer get?
- Keizer averages about 91 rainy days per year.
- What hardiness zone is Keizer?
- Keizer's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Keizer, Oregon sits in a warm-summer Mediterranean climate zone. January means hover near 42°F while July averages 69°F — a 27°F seasonal swing.
Across the year, Keizer receives about 40 inches of precipitation spread over roughly 91 rainy days.
The rhythm of the year is set by latitude (45.0°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.