Frost Dates for Monmouth, OR 97361
Last spring frost April 28 · First fall frost October 26 · 181 frost-free days · USDA Zone 8b
ZIP 97361 has about 14,500 people.
Long season: 181 frost-free days. Spring frost risk spans April 4–May 21 (47 days). Fall frost risk spans October 4–November 14 (41 days).
Frost probability for 97361
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 21 | April 28 | April 4 |
| Fall (first frost) | October 4 | October 26 | November 14 |
Dates come from NOAA 1971–2000 freeze probabilities at DALLAS 2 NE (19.6 km away); the 50% date is the median year.
Which crops fit a 181-day season in Monmouth
In Monmouth (181 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Mar 24 | May 12–May 19 | 139 | fits: 80 days to maturity, 139 available after May 12. | Jun 26 |
| Pepper | Mar 17 | May 12–May 19 | 139 | fits: 75 days to maturity, 139 available after May 12. | Jul 1 |
| Lettuce | Mar 3 | Mar 31–Apr 7 | 216 | two-plantings: Plant Mar 31 and again by Sep 4; both mature before Nov 2. | Sep 4 |
| Carrots | — | Apr 7–Apr 14 | 223 | fits: 70 days to maturity, 223 available after Apr 7. | Aug 24 |
| Cucumber | Apr 7 | May 12–May 19 | 153 | two-plantings: Plant May 12 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Beans | — | May 5–May 19 | 167 | two-plantings: Plant May 5 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Peas | — | Mar 3–May 12 | 244 | fits: 65 days to maturity, 244 available after Mar 3. | Aug 15 |
| Zucchini | Apr 14 | May 12–May 19 | 153 | two-plantings: Plant May 12 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Onion | Feb 3 | Mar 31–Apr 14 | 216 | fits: 100 days to maturity, 216 available after Mar 31. | — |
| Spinach | — | Mar 3–Apr 21 | 258 | two-plantings: Plant Mar 3 and again by Sep 23; both mature before Nov 16. | Sep 23 |
| Kale | Feb 17 | Mar 31–Apr 14 | 230 | two-plantings: Plant Mar 31 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Broccoli | Mar 3 | Mar 31–Apr 14 | 216 | fits: 80 days to maturity, 216 available after Mar 31. | Jul 31 |
| Cabbage | Mar 3 | Mar 31–Apr 14 | 230 | fits: 70 days to maturity, 230 available after Mar 31. | Aug 24 |
| Radish | — | Mar 3–May 26 | 244 | two-plantings: Plant Mar 3 and again by Sep 24; both mature before Nov 2. | Sep 24 |
| Beets | — | Mar 3–May 26 | 244 | two-plantings: Plant Mar 3 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Potatoes | — | Apr 14–Apr 21 | 202 | fits: 90 days to maturity, 202 available after Apr 14. | — |
| Garlic | — | Oct 26 | 286 | overwinter: Plant Oct 26 to Nov 16; harvest the following summer. | Nov 16 |
| Strawberry | — | Mar 24–May 19 | 237 | perennial: A perennial: plant Mar 24; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 31 | May 5–May 12 | 153 | fits: 75 days to maturity, 153 available after May 5. | Jul 8 |
| Pumpkin | Apr 14 | May 12–May 12 | 146 | fits: 100 days to maturity, 146 available after May 12. | Jun 13 |
| Cauliflower | Mar 17 | Apr 21–May 5 | 195 | fits: 75 days to maturity, 195 available after Apr 21. | Aug 5 |
| Swiss Chard | Mar 3 | Apr 14–Apr 14 | 202 | two-plantings: Plant Apr 14 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Arugula | — | Mar 3–May 26 | 258 | two-plantings: Plant Mar 3 and again by Sep 23; both mature before Nov 16. | Sep 23 |
| Brussel Sprouts | Mar 3 | Mar 31–Apr 14 | 230 | fits: 100 days to maturity, 230 available after Mar 31. | Jul 25 |
| Butternut Squash | Apr 14 | May 12–May 19 | 146 | fits: 100 days to maturity, 146 available after May 12. | Jun 13 |
| Eggplant | Mar 10 | May 12–May 19 | 139 | fits: 70 days to maturity, 139 available after May 12. | Jul 6 |
| Okra | Mar 31 | May 5–May 12 | 160 | two-plantings: Plant May 5 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Basil | Mar 24 | May 19–May 19 | 146 | two-plantings: Plant May 19 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Cilantro | — | Mar 31–Apr 21 | 216 | two-plantings: Plant Mar 31 and again by Aug 30; both mature before Nov 2. | Aug 30 |
| Parsley | Feb 17 | May 5–May 12 | 181 | fits: 70 days to maturity, 181 available after May 5. | Aug 10 |
| Celery | Feb 17 | May 5–May 19 | 181 | fits: 120 days to maturity, 181 available after May 5. | Jun 21 |
| Scallions | Feb 17 | Mar 31–Apr 14 | 230 | two-plantings: Plant Mar 31 and again by Sep 3; both mature before Nov 16. | Sep 3 |
| Turnip | — | Mar 31–Apr 14 | 230 | two-plantings: Plant Mar 31 and again by Sep 13; both mature before Nov 16. | Sep 13 |
| Kohlrabi | — | Mar 17–Mar 31 | 244 | two-plantings: Plant Mar 17 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Bok Choy | Mar 31 | Apr 21–Apr 28 | 195 | two-plantings: Plant Apr 21 and again by Sep 4; both mature before Nov 2. | Sep 4 |
| Collards | Feb 17 | Mar 31–Apr 14 | 230 | two-plantings: Plant Mar 31 and again by Sep 3; both mature before Nov 16. | Sep 3 |
| Cantaloupe | Apr 14 | May 12–May 19 | 139 | fits: 85 days to maturity, 139 available after May 12. | Jun 21 |
| Chives | Feb 3 | May 5–May 12 | 195 | fits: 90 days to maturity, 195 available after May 5. | — |
| Dill | — | Mar 3–May 26 | 244 | two-plantings: Plant Mar 3 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Oregano | Feb 17 | May 5–May 12 | 195 | fits: 80 days to maturity, 195 available after May 5. | — |
| Rosemary | Feb 3 | May 5–May 12 | 181 | fits: 80 days to maturity, 181 available after May 5. | — |
| Sage | Mar 3 | May 5–May 12 | 195 | fits: 75 days to maturity, 195 available after May 5. | — |
| Thyme | Feb 17 | May 5–May 12 | 195 | fits: 90 days to maturity, 195 available after May 5. | — |
| Calendula | Mar 17 | Apr 14–Apr 28 | 202 | two-plantings: Plant Apr 14 and again by Aug 30; both mature before Nov 2. | Aug 30 |
| Cosmos | Mar 31 | Apr 28–May 12 | 167 | two-plantings: Plant Apr 28 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Lavender | Feb 3 | Apr 28–May 12 | 202 | fits: 90 days to maturity, 202 available after Apr 28. | — |
| Marigolds | Mar 17 | Apr 28–May 5 | 167 | two-plantings: Plant Apr 28 and again by Aug 9; both mature before Oct 12. | Aug 9 |
| Melons | Apr 14 | May 12–May 19 | 139 | fits: 85 days to maturity, 139 available after May 12. | Jun 21 |
| Mint | — | Apr 28–May 12 | 202 | fits: 90 days to maturity, 202 available after Apr 28. | — |
| Nasturtiums | Mar 31 | Apr 28–May 5 | 167 | two-plantings: Plant Apr 28 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Pole Beans | — | May 5–May 19 | 160 | fits: 65 days to maturity, 160 available after May 5. | Jul 25 |
| Spaghetti Squash | Apr 14 | May 12–May 19 | 146 | fits: 90 days to maturity, 146 available after May 12. | Jun 23 |
| Sunflowers | — | Apr 28–May 12 | 167 | fits: 70 days to maturity, 167 available after Apr 28. | Jul 20 |
| Tomatillos | Mar 3 | May 5–May 12 | 146 | fits: 75 days to maturity, 146 available after May 5. | Jul 1 |
| Watermelon | Apr 14 | May 5–May 12 | 146 | fits: 80 days to maturity, 146 available after May 5. | Jun 26 |
| Yellow Squash | Apr 14 | May 12–May 19 | 153 | two-plantings: Plant May 12 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Zinnias | Mar 31 | Apr 28–May 12 | 167 | two-plantings: Plant Apr 28 and again by Jul 30; both mature before Oct 12. | Jul 30 |
Month by month in Monmouth
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 3), Lavender (Feb 3), Onion (Feb 3), Rosemary (Feb 3), Celery (Feb 17), Collards (Feb 17), +5 more. |
| March | Start indoors: Broccoli (Mar 3), Brussel Sprouts (Mar 3), Cabbage (Mar 3), Lettuce (Mar 3), Sage (Mar 3), Swiss Chard (Mar 3), +14 more. Direct sow from: Arugula (Mar 3), Beets (Mar 3), Dill (Mar 3), Peas (Mar 3), Radish (Mar 3), Spinach (Mar 3), +3 more. Transplant from: Broccoli (Mar 31), Brussel Sprouts (Mar 31), Cabbage (Mar 31), Collards (Mar 31), Kale (Mar 31), Lettuce (Mar 31), +2 more. Plant: Strawberry (Mar 24). |
| April | Start indoors: Cucumber (Apr 7), Butternut Squash (Apr 14), Cantaloupe (Apr 14), Melons (Apr 14), Pumpkin (Apr 14), Spaghetti Squash (Apr 14), +3 more. Direct sow from: Carrots (Apr 7), Potatoes (Apr 14), Sunflowers (Apr 28). Transplant from: Calendula (Apr 14), Swiss Chard (Apr 14), Bok Choy (Apr 21), Cauliflower (Apr 21), Cosmos (Apr 28), Lavender (Apr 28), +4 more. Last frost around April 28. |
| May | Direct sow from: Beans (May 5), Pole Beans (May 5). Transplant from: Celery (May 5), Chives (May 5), Corn (May 5), Okra (May 5), Oregano (May 5), Parsley (May 5), +17 more. |
| June | Last sowing dates: Butternut Squash (Jun 13), Pumpkin (Jun 13), Cantaloupe (Jun 21), Celery (Jun 21), Melons (Jun 21), Spaghetti Squash (Jun 23), +2 more. |
| July | Last sowing dates: Pepper (Jul 1), Tomatillos (Jul 1), Eggplant (Jul 6), Corn (Jul 8), Sunflowers (Jul 20), Brussel Sprouts (Jul 25), +6 more. |
| August | Last sowing dates: Nasturtiums (Aug 4), Okra (Aug 4), Yellow Squash (Aug 4), Zucchini (Aug 4), Cauliflower (Aug 5), Beans (Aug 6), +10 more. |
| September | Last sowing dates: Collards (Sep 3), Scallions (Sep 3), Bok Choy (Sep 4), Lettuce (Sep 4), Kale (Sep 8), Kohlrabi (Sep 8), +4 more. |
| October | Direct sow from: Garlic (Oct 26). First frost around October 26. |
| November | Last sowing dates: Garlic (Nov 16). |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Monmouth, OR (ZIP 97361)?
The median last spring frost date for Monmouth, OR (ZIP code 97361) is around April 28. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before April 4; one in ten it runs past May 21.
What is the first fall frost date in Monmouth, OR?
The median first fall frost date for Monmouth, OR is around October 26. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around October 4 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Monmouth, OR?
The frost-free growing season in Monmouth is about 181 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Monmouth (181 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Monmouth, OR?
Monmouth, OR is in USDA hardiness zone 8b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Monmouth, OR?
Start tomatoes indoors Mar 24 and plant out May 12 in Monmouth. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Monmouth?
Two: plant Mar 31 and again by Sep 4; both mature before Nov 2.
When do I plant garlic in Monmouth?
Oct 26 to Nov 16; it overwinters and is ready the following summer.
Can I get two tomato crops in Monmouth?
Yes: plant out May 12 for a summer crop, and set out a second round of transplants by Jun 26 for a fall crop.
Which nearby ZIP has a longer season?
Albany (ZIP 97322) has 190 frost-free days, 9 more than Monmouth (ZIP 97361). See Albany ZIP 97322 frost dates
Nearby and related
- Frost dates for Independence, OR 97351 (8.9 mi)
- Frost dates for Corvallis, OR 97330 (9.6 mi)
- Frost dates for Dallas, OR 97338 (11.3 mi)
- Frost dates for Salem, OR 97306 (13.3 mi)
- Frost dates for Albany, OR 97322 (18.3 mi)
- When to plant in OR
- When to plant Peppers in OR
- When to plant Cucumbers in OR
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- When to plant Basil in OR
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- Look up another ZIP