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Frost dates and planting calendar for Eugene, Oregon

Updated October 30, 2026. Based on USDA, NOAA and Colorado State University Extension data. Published by Humblebee.

USDA hardiness zone
8b[1]
Median last spring frost
Apr 11[2]
Median first fall frost
Oct 23[3]
Growing season, median
196 days[4]

Eugene, Oregon is in USDA hardiness zone 8b on the 2023 map[1]. The median last spring frost at the nearby NOAA station is April 11[2].

Frost dates

JanFebMarAprMayJunJulAugSepOctNovDecLast spring frost: 9 in 10 years after Mar 15, half of years Apr 11, 1 in 10 years after May 9Last frostmedian Apr 11First fall frost: 9 in 10 years before Nov 13, half of years Oct 23, 1 in 10 years before Oct 6First frostmedian Oct 23Frost riskHardyHardy vegetables: plant Mar 14 to Mar 28Mar 14 to Mar 28Semi-hardySemi-hardy vegetables: plant Mar 28 to Apr 11Mar 28 to Apr 11TenderTender vegetables: plant around Apr 11around Apr 11Very tenderVery tender vegetables: plant from Apr 25from Apr 25
Shaded: the span between the dates frost passes in 9 of 10 years and 1 of 10 years[2][3]. Green: planting windows from the CSU rules applied to the median last frost (GardenFacts calculation)[6]. Exact dates are in the tables below.

NOAA frost dates for Eugene come from the Eugene Mahlon Sweet Airport station, using records from 1991 to 2020[5]. In half of years the last spring frost comes after April 11, and in 1 of 10 years it comes after May 9[2]. In half of years the first fall frost comes before October 23, and in 1 of 10 years it comes before October 6[3]. These are odds from past years and not a forecast, so any year can be earlier or later[2].

Frost Likely (9 in 10 years) Even odds (5 in 10) Unlikely (1 in 10)
Last spring frost (32°F)[2] after March 15 after April 11 after May 9
First fall frost (32°F)[3] before October 6 before October 23 before November 13
  • Hard freeze (28°F): median last spring date March 3, median first fall date November 11[7].
  • Frost-free growing season: at least 162 days in 9 of 10 years, 196 days in half of years and 227 days in 1 of 10 years[4].
  • The low reached 32°F or colder in 100% of years and 28°F or colder in 100% of years[8].
  • Weather station: Eugene Mahlon Sweet Airport (USW00024221), 7 miles from the city center, 353 feet, 25 years of 1991 to 2020 records[5].

When to plant vegetables

Colorado State University Extension groups vegetables by how well they handle cold, and its guide was written for Colorado[6]. GardenFacts used the median last frost of April 11 as the average last frost[6]. Hardy vegetables such as lettuce, peas and spinach can go in as early as 2 to 4 weeks before that date, which is March 14 to March 28[6]. Semi-hardy vegetables such as carrots and potatoes can go in as early as March 28[9]. Tender vegetables such as snap beans and sweet corn can be sown from seed around April 11[10]. Very tender vegetables such as tomatoes and peppers typically start 2 or more weeks after the median last frost, so April 25 is the earliest start[11].

  • Hardy (broccoli, cabbage, kohlrabi, lettuce, onions, peas, radishes, spinach, turnips): as early as 2 to 4 weeks before the median last frost (April 11) is March 14 to March 28[6]
  • Semi-hardy (beets, carrots, cauliflower, parsnips, potatoes, Swiss chard): as early as 2 weeks before the median last frost (April 11) is March 28, up to the median date itself[9]
  • Tender (snap beans, sweet corn, cucumbers, summer squash): from seed around the median last frost date, April 11[10]
  • Very tender (cantaloupe, eggplant, peppers, tomatoes, winter squash, watermelon): the earliest start, two weeks after the median last frost (April 11), is April 25[11]
Vegetable (CSU group) Plant from First harvest around
Broccoli (hardy)[12] Mar 14 May 18 (from transplants)
Cabbage (hardy)[12] Mar 14 Jun 7 (from transplants)
Kohlrabi (hardy)[12] Mar 14 May 3
Lettuce (hardy)[12] Mar 14 May 13
Onions (hardy)[12] Mar 14 Jul 2
Peas (hardy)[12] Mar 14 May 18
Radishes (hardy)[12] Mar 14 Apr 13
Spinach (hardy)[12] Mar 14 Apr 23
Turnips (hardy)[12] Mar 14 May 3
Beets (semi-hardy)[12] Mar 28 May 27
Carrots (semi-hardy)[12] Mar 28 Jun 6
Cauliflower (semi-hardy)[12] Mar 28 not listed
Parsnips (semi-hardy)[12] Mar 28 Jun 6
Potatoes (semi-hardy)[12] Mar 28 Jul 31
Swiss chard (semi-hardy)[12] Mar 28 May 27
Snap beans (tender)[12] Apr 11 Jun 10
Sweet corn (tender)[12] Apr 11 Jun 10
Cucumbers (tender)[12] Apr 11 Jun 5
Summer squash (tender)[12] Apr 11 May 31
Cantaloupe (very tender)[12] Apr 25 Jul 19
Eggplant (very tender)[12] Apr 25 Jun 24 (from transplants)
Peppers (very tender)[12] Apr 25 Jul 4 (from transplants)
Tomatoes (very tender)[12] Apr 25 Jun 29 (from transplants)
Winter squash (very tender)[12] Apr 25 Aug 3
Watermelon (very tender)[12] Apr 25 Jul 19
Spacing, depth and soil temperature (CSU Extension)
Vegetable Min. soil temp Depth Spacing Days to harvest
Broccoli[13] 40°F 1/2 in 18 in 65
Cabbage[13] 40°F 1/2 in 18 in 85
Kohlrabi[13] 40°F 1/2 in 7-9 in 50
Lettuce[13] 35°F 1/4 in 7-9 in 60
Onions[13] 35°F 1/4 in (seed), 1-2 in (sets) 4-6 in 110
Peas[13] 40°F 1 in 4-6 in 65
Radishes[13] 40°F 1/2 in 2-3 in 30
Spinach[13] 40°F 1/2 in 4-6 in 40
Turnips[13] 40°F 1/2 in 4-6 in 50
Beets[13] 40°F 3/4-1 in 4-6 in 60
Carrots[13] 40°F 1/4 in 2-3 in 70
Cauliflower[13] 40°F 1/2 in 18 in –
Parsnips[13] 35°F 1/2 in 5-6 in 70
Potatoes[13] 45°F – – 125
Swiss chard[13] 40°F 1 in 7-9 in 60
Snap beans[13] 55°F 1-1 1/2 in 6 in 60
Sweet corn[13] 50°F 1-1 1/2 in 12 x 30 in or 9 x 36 in 60-90
Cucumbers[13] 60°F 1 in 6 in trellised, 24-36 in untrellised 55
Summer squash[13] 60°F 1-1 1/2 in 36-48 in 50
Cantaloupe[13] 60°F 1-1 1/2 in 36-48 in 85
Eggplant[13] 60°F 1/4 in 18-24 in 60
Peppers[13] 60°F 1/4 in 15-18 in 70
Tomatoes[13] 50°F 1/4 in 24 in trellised 65
Winter squash[13] 60°F 1-1 1/2 in 36-48 in 100
Watermelon[13] 60°F 1-1 1/2 in 36-48 in 85

Hardiness zone

Eugene is in zone 8b, which means the coldest night of a typical winter falls between 15°F and 20°F[1]. The zone is based on winter lows and not on summer heat or frost dates[14]. All of the city's land area sits in ZIP code areas rated zone 8b[15].

Zone 8b: average annual extreme minimum temperature 15°F to 20°F (1991 to 2020)[1]. Modeled value at the city center: 18.1°F[1].

Share of the city's land area by ZIP code zone: zone 8b 100%[15].

All towns in zone 8b and what zone 8b means

Zone by ZIP code
ZIP code Zone Coldest night range
97402[15] 8b 15 to 20°F
97405[15] 8b 15 to 20°F
97401[15] 8b 15 to 20°F
97404[15] 8b 15 to 20°F
97408[15] 8b 15 to 20°F
97403[15] 8b 15 to 20°F

Questions people ask

What growing zone is Eugene, Oregon?
The center of Eugene is in USDA zone 8b on the 2023 map[1]. All of the city's land area is in ZIP code areas rated 8b[15].
When is the last frost in Eugene?
At the NOAA Eugene airport station, the median last spring frost is April 11[2]. In 1 of 10 years the last frost comes after May 9[2].
When to plant tomatoes in Eugene?
CSU Extension says tomatoes typically go in 2 or more weeks after the average last frost[11]. Using the median last frost, the earliest start is April 25[11].
When is the first frost in Eugene?
In half of years the first fall frost comes before October 23[3]. In 1 of 10 years it comes before October 6[3].
How long is the growing season in Eugene?
In half of years the season between the last and first frost is at least 196 days[4]. In 9 of 10 years it is at least 162 days[4].

Facts and sources

  1. The 2023 USDA Plant Hardiness Zone Map puts the center of Eugene, Oregon in zone 8b. Zone 8b means an average annual extreme minimum temperature of 15°F to 20°F over 1991 to 2020. The map's modeled value at the city center is 18.1°F. USDA zone map 2023 (PRISM, OSU)
  2. Last spring frost (32°F) at this station: in 9 of 10 years the last frost comes after March 15, in half of years after April 11, and in 1 of 10 years after May 9 (NOAA 1991 to 2020 normals). The median last frost date is April 11. NOAA Climate Normals 1991-2020
  3. First fall frost (32°F) at this station: in 1 of 10 years the first frost comes before October 6, in half of years before October 23, and in 9 of 10 years before November 13 (NOAA 1991 to 2020 normals). The median first frost date is October 23. NOAA Climate Normals 1991-2020
  4. Growing season (days between the last spring and first fall 32°F frost) at this station: at least 162 days in 9 of 10 years, at least 196 days in half of years, and at least 227 days in 1 of 10 years. NOAA Climate Normals 1991-2020
  5. Frost dates on this page come from NOAA climate normals for the Eugene Mahlon Sweet Airport weather station (USW00024221), 7 miles from the center of Eugene at 353 feet, using 25 years of records from 1991 to 2020. NOAA Climate Normals 1991-2020
  6. Colorado State University Extension's vegetable planting guide (written for Colorado) groups broccoli, cabbage, kohlrabi, lettuce, onions, peas, radishes, spinach, turnips as hardy vegetables, with this rule: as early as 2-4 weeks before the average last... CSU Extension GardenNotes #720
  7. Hard freeze (28°F) at this station: the median last spring date is March 3 and the median first fall date is November 11. NOAA Climate Normals 1991-2020
  8. At this station the low reached 32°F or colder in 100% of years from 1991 to 2020, and 28°F or colder in 100% of years. NOAA Climate Normals 1991-2020
  9. Colorado State University Extension's vegetable planting guide (written for Colorado) groups beets, carrots, cauliflower, parsnips, potatoes, Swiss chard as semi-hardy vegetables, with this rule: as early as 0-2 weeks before the average last spring frost.... CSU Extension GardenNotes #720
  10. Colorado State University Extension's vegetable planting guide (written for Colorado) groups snap beans, sweet corn, cucumbers, summer squash as tender vegetables, with this rule: from seed around the average last spring frost; cucumber and summer squash... CSU Extension GardenNotes #720
  11. Colorado State University Extension's vegetable planting guide (written for Colorado) groups cantaloupe, eggplant, peppers, tomatoes, winter squash, watermelon as very tender vegetables, with this rule: typically 2 or more weeks after the average last... CSU Extension GardenNotes #720
  12. GardenFacts calculation: earliest planting date plus CSU days to harvest (table on this page), from the station's median last frost. NOAA Climate Normals 1991-2020
  13. CSU Extension vegetable table: soil temperature, depth, spacing, days to harvest (table on this page). CSU Extension GardenNotes #720
  14. USDA hardiness zones are based on the average annual extreme minimum winter temperature (the coldest night of each winter, averaged over 1991 to 2020 for the 2023 map), not on summer heat or frost dates. Each zone spans 10°F and each half zone (a or b)... USDA Plant Hardiness Zone Map
  15. Eugene, Oregon overlaps 6 ZIP code areas. By land area, 100% lies in ZIP code areas rated zone 8b. USDA zone map 2023 (PRISM, OSU)

Frost dates are probabilities from 1991 to 2020 weather records at one NOAA station, not a forecast. Any year can be earlier or later. The hardiness zone describes the average coldest winter night, not frost dates or summer heat. Spots inside the city can differ (ZIP table). Planting rules come from Colorado State University Extension's guide, written for Colorado. A local extension office may give dates tuned to the area. Planting and harvest dates marked GardenFacts calculation are simple arithmetic from the facts above, not advice from the source.

Hardiness zone data: USDA Plant Hardiness Zone Map (2023), USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu, accessed October 30, 2026. This is not the official USDA map. Frost data: NOAA NCEI U.S. Climate Normals 1991-2020. Planting rules: Colorado State University Extension.